This patch adds a bunch of stuff from FreeBSD5. It consistantly makes

This patch adds a bunch of stuff from FreeBSD5.  It consistantly makes
vendor specific drivers depend on agp, consistantly checks the gart size
!= 0, changes agp_generic_enable to the FreeBSD5 function, initializing
the device as v2 or v3 accordingly, syncs up agpio.h, and adds a couple
PCI Ids from FreeBSD5.

Submitted-by: Craig Dooley <cd5697@albany.edu>