drm/amd/display: Add disable triple buffering DC debug option

Added a "disable_tri_buf" DC debug option. When set to 1  feature will
be off.
Signed-off-by: NCharlene Liu <charlene.liu@amd.com>
Reviewed-by: NDmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: NLeo Li <sunpeng.li@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -257,6 +257,7 @@ struct dc_debug_options {
 	bool skip_detection_link_training;
 	unsigned int force_odm_combine; //bit vector based on otg inst
 	unsigned int force_fclk_khz;
+	bool disable_tri_buf;
 };
 
 struct dc_debug_data {