drm/tegra: Run hub cleanup on ->remove()

The call to tegra_display_hub_cleanup() that takes care of disabling the
window groups is missing from the driver's ->remove() callback. Call it
to make sure the runtime PM reference counts for the display controllers
are balanced.
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/drm.c

@@ -1241,6 +1241,9 @@ static int host1x_drm_remove(struct host1x_device *dev)
 	drm_atomic_helper_shutdown(drm);
 	drm_mode_config_cleanup(drm);
 
+	if (tegra->hub)
+		tegra_display_hub_cleanup(tegra->hub);
+
 	err = host1x_device_exit(dev);
 	if (err < 0)
 		dev_err(&dev->dev, "host1x device cleanup failed: %d\n", err);