drm/amd/display: Adding flag for forced MST blocked discovery

[Why]
Need a flag to force MST blocked discovery for certain branch devices.

[How]
Added a flag to force MST blocked discovery in struct dc_panel_patch.

Reviewed-by: PeiChen Huang <peichen.huang@amd.com>
Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Meenakshikumar Somasundaram

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

@@ -181,6 +181,7 @@ struct dc_panel_patch {
 	unsigned int disable_colorimetry;
 	uint8_t blankstream_before_otg_off;
 	bool oled_optimize_display_on;
+	unsigned int force_mst_blocked_discovery;
 };
 
 struct dc_edid_caps {