Revert agp_intel.c part of the r274040 for now.  There is a confusion
on my part about north bridge/GPU pci ids and use of aperture.

Leave the agp_intel.c out of static compilation on amd64, it makes the
things consistent with agp.ko.

Pointed out by:	tijl
Sponsored by:	The FreeBSD Foundation
MFC after:	13 days


git-svn-id: svn+ssh://svn.freebsd.org/base/head@274084 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f