seabios-hppa: Update SeaBIOS-hppa to VERSION 5

New features and fixes in SeaBIOS for hppa/parisc:

* STI firmware now contains additional fonts built-in, which
  can be selected with qemu command-line options:
        -fw_cfg opt/font,string=1       - a HP 8x16 font
        -fw_cfg opt/font,string=2       - a HP 6x13 font
        -fw_cfg opt/font,string=3       - a HP 10x20 font
        -fw_cfg opt/font,string=4       - a Linux 16x32 font

* Fixed PS/2 keyboard emulation when running in graphical mode.
  This allows to type boot commands in the firmware boot menu if
  qemu was started with "-boot menu=on" (and no linux kernel was
  given on the qemu command line).

* Fix firmware rendenzvous code to clear all pending external intrrupts
  before entering the waiting loop.

Signed-off-by: Helge Deller <deller@gmx.de>

seabios-hppa @ 17ca7a99

-Subproject commit bf3404006fd2c832857eb57e6f853862f97dacea
+Subproject commit 17ca7a9998c1755d42321cfc0afb5f480f5a58ff