[PATCH] sis 760 support.

This patch adds the SiS 760 ID to the amd64-agp driver, so that agpgart can be
used on Athlon64 boards based on this chip.

Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>