Update SeaBIOS to 0.6.1.2

 - 06d0bdd Minor build fixes.
 - 33abfc0 Update version to 0.6.1.2.
 - 484dd56 fix virtio-blk failure after reboot
 - dd9c0d3 Update version to 0.6.1.1.
 - 50ecfa8 mark irq9 active high in DSDT
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

seabios @ 06d0bdd9

-Subproject commit 0ff9051f756ba739bc2edca77925191c3c6cbc2f
+Subproject commit 06d0bdd9e2e20377b3180e4986b14c8549b393e4