drm/amd/display: Minor fix for dc_sink refactor

Signed-off-by: NHarry Wentland <harry.wentland@amd.com>
Reviewed-by: NHarry Wentland <Harry.Wentland@amd.com>
Reviewed-by: NTony Cheng <Tony.Cheng@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_resource.c

@@ -1321,7 +1321,7 @@ static struct audio *find_first_free_audio(
 static void update_stream_signal(struct core_stream *stream)
 {
 	if (stream->public.output_signal == SIGNAL_TYPE_NONE) {
-		const struct dc_sink *dc_sink = stream->public.sink;
+		struct dc_sink *dc_sink = stream->public.sink;
 
 		if (dc_sink->sink_signal == SIGNAL_TYPE_NONE)
 			stream->signal = stream->sink->link->connector_signal;

drivers/gpu/drm/amd/display/dc/dc.h

@@ -469,7 +469,7 @@ enum surface_update_type {
  * Stream Interfaces
  ******************************************************************************/
 struct dc_stream {
-	const struct dc_sink *sink;
+	struct dc_sink *sink;
 	struct dc_crtc_timing timing;
 
 	struct rect src; /* composition area */