drm/fsl-dcu: disable output polling on driver unload

Disabling output polling before unloading the driver.
Signed-off-by: Stefan Agner <stefan@agner.ch>

drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c

@@ -91,6 +91,8 @@ static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
 
 	return 0;
 done:
+	drm_kms_helper_poll_fini(dev);
+
 	if (fsl_dev->fbdev)
 		drm_fbdev_cma_fini(fsl_dev->fbdev);
 
@@ -106,6 +108,8 @@ static int fsl_dcu_unload(struct drm_device *dev)
 {
 	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 
+	drm_kms_helper_poll_fini(dev);
+
 	if (fsl_dev->fbdev)
 		drm_fbdev_cma_fini(fsl_dev->fbdev);