drm/nouveau/kms: execute drm_mode_config_reset() after constructing display

This will ensure we have some kind of initial atomic state for all objects
after initialisation.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_display.c

@@ -530,6 +530,8 @@ nouveau_display_create(struct drm_device *dev)
 	if (ret)
 		goto disp_create_err;
 
+	drm_mode_config_reset(dev);
+
 	if (dev->mode_config.num_crtc) {
 		ret = nouveau_display_vblank_init(dev);
 		if (ret)