drm/amd/display: stop top_mgr when type change to non-MST during s3

[Why]
Driver keeps the invalid information cause report the
incorrect monitor which save in remote sink to OS

[How]
When connector type change from MST to non-MST,
stop the topology manager.

Signed-off-by: Lewis Huang <[e-mail]>
Reviewed-by: Tony Cheng <[e-mail]>
Acked-by: Qingqing Zhuo <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 	struct dpcd_caps prev_dpcd_caps;
 	bool same_dpcd = true;
 	enum dc_connection_type new_connection_type = dc_connection_none;
+	enum dc_connection_type pre_connection_type = dc_connection_none;
 	bool perform_dp_seamless_boot = false;
 	const uint32_t post_oui_delay = 30; // 30ms
 
···
 
 	link_disconnect_sink(link);
 	if (new_connection_type != dc_connection_none) {
+		pre_connection_type = link->type;
 		link->type = new_connection_type;
 		link->link_state_valid = false;
 
···
 					/* Downstream unplug */
 					dc_sink_release(prev_sink);
 				return true;
+			}
+
+			// link switch from MST to non-MST stop topology manager
+			if (pre_connection_type == dc_connection_mst_branch &&
+				link->type != dc_connection_mst_branch) {
+				dm_helpers_dp_mst_stop_top_mgr(link->ctx, link);
 			}
 
 			if (link->type == dc_connection_mst_branch) {