Grab a patch for keyboard on sparc64 from Xorg CVS. This makes 'kbd' driver
work properly this time on FreeBSD/sparc64 so stop using workaround that
defaults to old 'keyboard' one and remove erroneous patch by me.

Pointed out by: Matthias Muthmann (mmuthmann at gmx.net)
Tested by: Matthias Muthmann (Ultra10/type5c), me (Ultra5/type5)
Obtained from: Xorg CVS