Refix memory handling for machines with less than 256M broken by revision 1.64.
Refix memory handling for machines with less than 256M broken by revision 1.64.

Allows my DSR-500 to boot again.

Okay miod@.

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