drm/etnaviv: use deferrable timer for hangcheck handler

The hangcheck handler is already running with very coarse timeouts,
so it doesn't hurt to combine this timer with other wakeups in the
system.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

drivers/gpu/drm/etnaviv/etnaviv_gpu.c

@@ -1528,8 +1528,8 @@ static int etnaviv_gpu_bind(struct device *dev, struct device *master,
 	INIT_WORK(&gpu->recover_work, recover_worker);
 	init_waitqueue_head(&gpu->fence_event);
 
-	setup_timer(&gpu->hangcheck_timer, hangcheck_handler,
-			(unsigned long)gpu);
+	setup_deferrable_timer(&gpu->hangcheck_timer, hangcheck_handler,
+			       (unsigned long)gpu);
 
 	priv->gpu[priv->num_gpus++] = gpu;