hw/arm/nseries: Fix loading kernel image on n8x0 machines

Commit 7998beb9 removed the ram_size initialization in the
arm_boot_info structure, however it is used by arm_load_kernel().

Initialize the field to fix:

  $ qemu-system-arm -M n800 -append 'console=ttyS1' \
    -kernel meego-arm-n8x0-1.0.80.20100712.1431-vmlinuz-2.6.35~rc4-129.1-n8x0
  qemu-system-arm: kernel 'meego-arm-n8x0-1.0.80.20100712.1431-vmlinuz-2.6.35~rc4-129.1-n8x0' is too large to fit in RAM (kernel size 1964608, RAM size 0)

Noticed while running the test introduced in commit 050a82f0
("tests/acceptance: Add a test for the N800 and N810 arm machines").

Fixes: 7998beb9 ("arm/nseries: use memdev for RAM")
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Thomas Huth <thuth@redhat.com>
Message-id: 20201019095148.1602119-1-f4bug@amsat.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/nseries.c

@@ -1318,6 +1318,7 @@ static void n8x0_init(MachineState *machine,
         g_free(sz);
         exit(EXIT_FAILURE);
     }
+    binfo->ram_size = machine->ram_size;
 
     memory_region_add_subregion(get_system_memory(), OMAP2_Q2_BASE,
                                 machine->ram);