Upgrade OpenSBI from v0.6 to v0.7 and the pre-built bios images.

The v0.7 release includes the following commits:

f64f4b9 lib: Add a new platform feature to bringup secondary harts
b677a9b lib: Implement hart hotplug
5b48240 lib: Add possible hart status values
e3f69fc lib: Implement Hart State Management (HSM) SBI extension
6704216 lib: Check MSIP bit after returning from WFI
82ae8e8 makefile: Do setup of the install target more flexible
e1a5b73 platform: sifive: fu540: allow sv32 as an mmu-type
8c83fb2 lib: Fix return type of sbi_hsm_hart_started()
00d332b include: Move bits related defines and macros to sbi_bitops.h
a148996 include: sbi_bitops: More useful bit operations
4a603eb platform: kendryte/k210: Set per-HART stack size to 8KB
678c3c3 include: sbi_scratch: Set per-HART scratch size to 4KB
2abc55b lib: Sort build objects in alphabetical order
6e87507 platform: ae350: Sort build objects in alphabetical order
650c0e5 lib: sbi: Fix coding style issues
078686d lib: serial: Fix coding style issues
3226bd9 lib: Simple bitmap library
c741abc include: Simple hartmask library
d6d7e18 lib: sbi_init: Don't allow HARTID greater than SBI_HARTMASK_MAX_BITS
a4a6a81 lib: Introduce SBI_TLB_INFO_INIT() helper macro
d963164 lib: sbi_tlb: Use sbi_hartmask in sbi_tlb_info
71d2b83 lib: Move all coldboot wait APIs to sbi_init.c
2b945fc lib: sbi_init: Use hartmask for coldboot wait
44ce5b9 include: Remove disabled_hart_mask from sbi_platform
2db381f lib: Introduce sbi_hsm_hart_started_mask() API
61f7768 lib: sbi_ecall_legacy: Use sbi_hsm_hart_started_mask() API
466fecb lib: sbi_system: Use sbi_hsm_hart_started_mask() API
9aad831 lib: sbi_ipi: Use sbi_hsm_hart_started_mask() API
eede1aa lib: sbi_hart: Remove HART available mask and related APIs
757bb44 docs: Remove out-of-date documentation
86d37bb lib: sbi: Fix misaligned trap handling
ffdc858 platform: ariane-fpga: Change license for ariane-fpga from GPL-2.0 to BSD-2
4b2f594 sbi: Add definitions for true/false
0cfe49a libfdt: Add INT32_MAX and UINT32_MAX in libfdt_env.h
baac7e0 libfdt: Upgrade to v1.5.1 release
f92147c include: Make sbi_hart_id_to_scratch() as macro
eeae3d9 firmware: fw_base: Optimize _hartid_to_scratch() implementation
16e7071 lib: sbi_hsm: Optimize sbi_hsm_hart_get_state() implementation
823345e include: Make sbi_current_hartid() as macro in riscv_asm.h
9aabba2 Makefile: Fix distclean make target
9275ed3 platform: ariane-fpga: Set per-HART stack size to 8KB
2343efd platform: Set per-HART stack size to 8KB in the template platform codes
72a0628 platform: Use one unified per-HART stack size macro for all platforms
327ba36 scripts: Cover sifive/fu540 in the 32-bit build
5fbcd62 lib: sbi: Update pmp_get() to return decoded size directly
dce8846 libfdt: Compile fdt_addresses.c
fcb1ded lib: utils: Add a fdt_reserved_memory_fixup() helper
666be6d platform: Clean up include header files
6af5576 lib: utils: Move PLIC DT fix up codes to fdt_helper.c
e846ce1 platform: andes/ae350: Fix up DT for reserved memory
8135520 platform: ariane-fpga: Fix up DT for reserved memory
c9a5268 platform: qemu/virt: Fix up DT for reserved memory
6f9bb83 platform: sifive/fu540: Fix up DT for reserved memory
1071f05 platform: sifive/fu540: Remove "stdout-path" fix-up
dd9439f lib: utils: Add a fdt_cpu_fixup() helper
3f1c847 platform: sifive/fu540: Replace cpu0 node fix-up with the new helper
db6a2b5 lib: utils: Add a general device tree fix-up helper
3f8d754 platform: Update to call general DT fix-up helper
87a7ef7 lib: sbi_scratch: Introduce HART id to scratch table
e23d3ba include: Simplify HART id to scratch macro
19bd531 lib: sbi_hsm: Simplify hart_get_state() and hart_started() APIs
3ebfe0e lib: sbi_tlb: Simplify sbi_tlb_entry_process() function
209134d lib: Handle failure of sbi_hartid_to_scratch() API
bd6ef02 include: sbi_platform: Improve sbi_platform_hart_disabled() API
c9f60fc lib: sbi_scratch: Don't set hartid_to_scratch table for disabled HART
680b098 lib: sbi_hsm: Don't use sbi_platform_hart_count() API
db187d6 lib: sbi_hsm: Remove scratch parameter from hart_started_mask() API
814f38d lib: sbi_hsm: Don't use sbi_platform_hart_disabled() API
75eec9d lib: Don't use sbi_platform_hart_count() API
c51f02c include: sbi_platform: Introduce HART index to HART id table
315a877 platform: sifive/fu540: Remove FU540_ENABLED_HART_MASK option
a0c88dd lib: Fix sbi_ecall_register_extension to prevent extension IDs overlap
9a74a64 lib: Check MSIP bit after returning from WFI
5968894 platform: Move ariane standalone fpga project to its own project
ed265b4 platform: fpga/ariane: Remove redundant plic address macros
fb84879 platform: Add OpenPiton platform support
d1d6560 platform: fpga/common: Add a fdt parsing helper functions
040e4e2 lib: utils: Move fdt fixup helper routines to a different file
4c37451 platform: openpiton: Read the device configurations from device tree
4d93586 lib: prevent coldboot_lottery from overflowing
550ba88 scripts: Extend create-binary-archive.sh for unified binary tar ball
160c885 lib: utils: Improve fdt_cpu_fixup() implementation
1de66d1 lib: Optimize unpriv load/store implementation
626467c lib: Remove scratch parameter from unpriv load/store functions
cb78a48 lib: sbi_trap: Remove scratch parameter from sbi_trap_redirect()
d11c79c lib: sbi_emulate_csr: Remove scratch and hartid parameter
5a7bd0c lib: sbi_illegal_insn: Remove mcause, scratch and hartid parameters
fe37d7d lib: sbi_misaligned_ldst: Remove mcause, scratch and hartid parameters
7487116 lib: sbi_ecall: Remove mcause, scratch and hartid parameters
40b221b lib: sbi_trap: Simplify sbi_trap_handler() API
7b211ff include: sbi_platform: Remove priv parameter from hart_start() callback
5b6957e include: Use more consistent name for atomic xchg() and cmpxchg()
dd0f21c lib: sbi_scratch: Introduce sbi_scratch_last_hartid() API
54b2779 include: sbi_tlb: Remove scratch parameter from sbi_tlb_request()
9e52a45 include: sbi_ipi: Remove scratch parameter from most functions
ec0d80f include: sbi_system: Remove scratch parameter and redundant functions
0a28ea5 include: sbi_timer: Remove scratch parameter from most funcitons
648507a include: sbi_console: Remove scratch parameter from sbi_dprintf()
e5a7f55 platform: thead/c910: Use HSM extension to boot secondary cores
f281de8 lib: irqchip/plic: Fix maximum priority threshold value
6c7922e lib: Support vector extension
615587c docs: Update README about supported SBI versions
66d0184 lib: Allow overriding SBI implementation ID
9f1b72c include: Bump-up version to 0.7

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>