Tweak some of the existing ATI IXP entries for more consistent naming and add some missing IXP300 entries.
Tweak some of the existing ATI IXP entries for more consistent
naming and add some missing IXP300 entries.

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