Save and restore the PSW value when making a PDC call, rather than blindly reloading from kpsl.
Save and restore the PSW value when making a PDC call, rather than blindly
reloading from kpsl.

ok kettenis@

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