msm:sde:rotator Async suspend/resume callbacks.

Make rotator suspend/resume callbacks asynchronous, improving
suspend/resume latency.

Bug: 134703102
Change-Id: I13b306478241369acec4d1e70392f66e7a10ced9
Signed-off-by: Vincent Palomares <paillon@google.com>

drivers/media/platform/msm/sde/rotator/sde_rotator_dev.c

@@ -3579,6 +3579,8 @@ static int sde_rotator_probe(struct platform_device *pdev)
 		rot_dev->kthread_free[i] = true;
 	}
 
+	device_enable_async_suspend(&pdev->dev);
+
 	SDEDEV_INFO(&pdev->dev, "SDE v4l2 rotator probe success\n");
 
 	return 0;