[Why & How]
Add set backlight to hw sequencer, dmu communication will
be handled in hw sequencer for new asics.
Signed-off-by: NYongqiang Sun <yongqiang.sun@amd.com>
Reviewed-by: NAnthony Koo <Anthony.Koo@amd.com>
Acked-by: NAurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>