Mask out the TEX remap and the Access Flag bits when setting the system control register. Also actually use the mask.
Mask out the TEX remap and the Access Flag bits when setting the
system control register. Also actually use the mask.

ok miod@

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