drm/radeon/kms: skip cb/db checking if SX_MISC is 1 on r600+

Signed-off-by: Marek Olšák <maraeo@gmail.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
5 files changed