media: entity: Add a nop variant of media_entity_cleanup

Add nop variant of media_entity_cleanup. This allows calling
media_entity_cleanup whether or not Media controller is enabled,
simplifying driver code.

Also drop #ifdefs on a few drivers around media_entity_cleanup().

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/i2c/ov2659.c

@@ -1474,9 +1474,7 @@ static int ov2659_probe(struct i2c_client *client,
 
 error:
 	v4l2_ctrl_handler_free(&ov2659->ctrls);
-#if defined(CONFIG_MEDIA_CONTROLLER)
 	media_entity_cleanup(&sd->entity);
-#endif
 	mutex_destroy(&ov2659->lock);
 	return ret;
 }
@@ -1488,9 +1486,7 @@ static int ov2659_remove(struct i2c_client *client)
 
 	v4l2_ctrl_handler_free(&ov2659->ctrls);
 	v4l2_async_unregister_subdev(sd);
-#if defined(CONFIG_MEDIA_CONTROLLER)
 	media_entity_cleanup(&sd->entity);
-#endif
 	mutex_destroy(&ov2659->lock);
 
 	return 0;