tee: Adapt documentation to cover recent additions

The previous commits introduced some helpers to reduce boilerplate
and bus specific callbacks for probe and remove.

Adapt the reference example to make use of these.

Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

Author: ukleinek

Documentation/driver-api/tee.rst

@@ -43,24 +43,12 @@ snippet would look like::
 	MODULE_DEVICE_TABLE(tee, client_id_table);
 
 	static struct tee_client_driver client_driver = {
+		.probe		= client_probe,
+		.remove		= client_remove,
 		.id_table	= client_id_table,
 		.driver		= {
 			.name		= DRIVER_NAME,
-			.bus		= &tee_bus_type,
-			.probe		= client_probe,
-			.remove		= client_remove,
 		},
 	};
 
-	static int __init client_init(void)
-	{
-		return driver_register(&client_driver.driver);
-	}
-
-	static void __exit client_exit(void)
-	{
-		driver_unregister(&client_driver.driver);
-	}
-
-	module_init(client_init);
-	module_exit(client_exit);
+	module_tee_client_driver(client_driver);