drm/fsl: Drop drm_vblank_cleanup

Again cleanup before irq disabling doesn't really stop the races,
so just drop it. Proper fix would be to put drm_atomic_helper_shutdown
before everything gets cleaned up.

Cc: Stefan Agner <stefan@agner.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Stefan Agner <stefan@agner.ch>

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

@@ -109,7 +109,6 @@ done:
 		drm_fbdev_cma_fini(fsl_dev->fbdev);
 
 	drm_mode_config_cleanup(dev);
-	drm_vblank_cleanup(dev);
 	drm_irq_uninstall(dev);
 	dev->dev_private = NULL;
 
@@ -127,7 +126,6 @@ static void fsl_dcu_unload(struct drm_device *dev)
 		drm_fbdev_cma_fini(fsl_dev->fbdev);
 
 	drm_mode_config_cleanup(dev);
-	drm_vblank_cleanup(dev);
 	drm_irq_uninstall(dev);
 
 	dev->dev_private = NULL;