drm/radeon/kms/atom: cleanup and unify DVO handling
Handle all the various asic family specific things for DVO.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
authored by Alex Deucher and committed by Dave Airlie 99999aaa 8b834852