drm/amd/display: Allow Diagnostics test with eDP not connected

[Why]
Diagnostics DIO test with eDP not connected is required to run

[How]
Allow Diagnostics test with eDP not connected to skip link detection but
still execute DIO test
Signed-off-by: NEric Bernstein <eric.bernstein@amd.com>
Reviewed-by: NDmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: NQingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -186,9 +186,10 @@ static bool create_links(
 			bool should_destory_link = false;
 
 			if (link->connector_signal == SIGNAL_TYPE_EDP) {
-				if (dc->config.edp_not_connected)
-					should_destory_link = true;
-				else if (dc->debug.remove_disconnect_edp) {
+				if (dc->config.edp_not_connected) {
+					if (!IS_DIAG_DC(dc->ctx->dce_environment))
+						should_destory_link = true;
+				} else {
 					enum dc_connection_type type;
 					dc_link_detect_sink(link, &type);
 					if (type == dc_connection_none)