drm/radeon/kms: add quirk for Mac Radeon HD 2600 card

Reported-by: 屋国遥 <hyagni@gmail.com>
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
1 file changed