Added wd, fd & acd major numbers.  Fixed a typo.  Fake isadma define.
Added wd, fd & acd major numbers.  Fixed a typo.  Fake isadma define.

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