Make pmap_steal_memory() return KSEG0 addresses only for kernels linked at KSEG0 addresses.
Make pmap_steal_memory() return KSEG0 addresses only for kernels linked at
KSEG0 addresses.

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