seabios: update to b1c35f2b28cc0c94ebed8176ff61ac0e0b377798

This patch updates the seabios submodule to commit
b1c35f2b28cc0c94ebed8176ff61ac0e0b377798.

Most important change is that seabios sets the busmaster bit
in the pci config space for the lsi and esp scsi host adapters.
Since commit 1c380f94 qemu
is strict here and disallows any dma access when the bit is
clear.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>