drm: rcar-du: Don't disable unused functions at init time

All encoders and CRTCs start disabled, re-disabling them is a no-op.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

drivers/gpu/drm/rcar-du/rcar_du_kms.c

@@ -448,8 +448,6 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 
 	drm_kms_helper_poll_init(dev);
 
-	drm_helper_disable_unused_functions(dev);
-
 	fbdev = drm_fbdev_cma_init(dev, 32, dev->mode_config.num_crtc,
 				   dev->mode_config.num_connector);
 	if (IS_ERR(fbdev))