Requires enabling the vblank machinery for them.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2030Acked-by: NAlex Deucher <alexander.deucher@amd.com>
Reviewed-by: NHarry Wentland <harry.wentland@amd.com>
Signed-off-by: NMichel Dänzer <mdaenzer@redhat.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>