drm/amd/display: Workaround to disable YCbCr

[Why]
Some mst dock can't translate DP to HDMI properly.

[How]
Bypass YCbCr timings on specific MST device.
Signed-off-by: Jinze Xu <jinze.xu@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -54,6 +54,7 @@ static bool dc_sink_construct(struct dc_sink *sink, const struct dc_sink_init_da
 	sink->ctx = link->ctx;
 	sink->dongle_max_pix_clk = init_params->dongle_max_pix_clk;
 	sink->converter_disable_audio = init_params->converter_disable_audio;
+	sink->is_mst_legacy = init_params->sink_is_legacy;
 	sink->dc_container_id = NULL;
 	sink->sink_id = init_params->link->ctx->dc_sink_id_count;
 	// increment dc_sink_id_count because we don't want two sinks with same ID

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

@@ -1079,7 +1079,7 @@ struct dc_sink {
 	void *priv;
 	struct stereo_3d_features features_3d[TIMING_3D_FORMAT_MAX];
 	bool converter_disable_audio;
-
+	bool is_mst_legacy;
 	struct dc_sink_dsc_caps dsc_caps;
 	struct dc_sink_fec_caps fec_caps;
 
@@ -1106,6 +1106,7 @@ struct dc_sink_init_data {
 	struct dc_link *link;
 	uint32_t dongle_max_pix_clk;
 	bool converter_disable_audio;
+	bool sink_is_legacy;
 };
 
 struct dc_sink *dc_sink_create(const struct dc_sink_init_data *init_params);