Add definitions for 4 additionl BAT registers, found on some newer PowerPC chips, like MPC8xxx family.
Add definitions for 4 additionl BAT registers, found on some newer PowerPC
chips, like MPC8xxx family.

ok kettenis@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars