don't post me: update bios

update bios binaries to 55480e81704fa46429ac5bb4f8f452fadc9c0416
acpi-build: it's not a bug for mmcfg to be 0
acpi-build: byte swap reserved signature
acpi-build: quick hack, fix mmcfg
ssdt: fix PBLK length

We don't really support CPU throttling, so supply 0 PBLK length.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>