drm/vmwgfx: Fix kms preferred mode sorting

The preferred mode typically didn't end up first, since the function
drm_mode_connector_list_update() reordered the modes.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>

drivers/gpu/drm/vmwgfx/vmwgfx_kms.c

@@ -1554,11 +1554,9 @@ int vmw_du_connector_fill_modes(struct drm_connector *connector,
 		drm_mode_probed_add(connector, mode);
 	}
 
-	/* Move the prefered mode first, help apps pick the right mode. */
-	if (du->pref_mode)
-		list_move(&du->pref_mode->head, &connector->probed_modes);
-
 	drm_mode_connector_list_update(connector, true);
+	/* Move the prefered mode first, help apps pick the right mode. */
+	drm_mode_sort(&connector->modes);
 
 	return 1;
 }