update seabios to 1.7.5.1 stable release
git shortlog since 1.7.5:
Hannes Reinecke (1):
megasas: read addional PCI I/O bar
Kevin O'Connor (5):
boot: Change ":rom%d" boot order rom instance to ":rom%x"
vgabios: Return from handle_1011() if handler found.
Don't enable thread preemption during S3 resume vga option rom execution.
build: Avoid absolute paths during "whole-program" compiling.
ehci: Fix bug in hub port assignment
Marcel Apfelbaum (1):
hw/pci: reserve IO and mem for pci express downstream ports with no devices attached
Markus Armbruster (1):
boot: Fix boot order for SCSI target, lun > 9
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>