nuke rominterpret and update romgetcursoraddr() to work on sparc64; based on NetBSD work.
nuke rominterpret and update romgetcursoraddr() to work on sparc64; based on NetBSD work.

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