drm: bridge: analogix: Unregister dp aux when unbinding

The dp aux is registered when binding analogix dp.
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1491481885-13775-3-git-send-email-jeffy.chen@rock-chips.com

drivers/gpu/drm/bridge/analogix/analogix_dp_core.c

@@ -1447,6 +1447,7 @@ void analogix_dp_unbind(struct device *dev, struct device *master,
 			DRM_ERROR("failed to detach the panel\n");
 	}
 
+	drm_dp_aux_unregister(&dp->aux);
 	pm_runtime_disable(dev);
 }
 EXPORT_SYMBOL_GPL(analogix_dp_unbind);