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>

diff --cc drivers/gpu/drm/radeon/radeon.h
Simple merge

diff --cc drivers/gpu/drm/radeon/radeon_encoders.c
Simple merge

diff --cc drivers/gpu/drm/radeon/radeon_legacy_encoders.c
Simple merge

diff --cc drivers/gpu/drm/radeon/radeon_mode.h
Simple merge