From: Scott Fudally <sfudally@fau.edu>

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.

Scott already submitted this but did not recieve any response. To ensure it
has been sent in correctly, I am resubmitting this now on his behalf.

Signed-off-by: Daniel Drake <dsd@gentoo.org>