staging: unisys: visorinput: Add module_driver driver registration

1. Remove module_init()/module_exit() macroes and
visorbus_register_visor_driver/visorbus_unregister_visor_driver
functions.
2. Replace with a short module_driver macro

Signed-off-by: Alex Briskin <br.shurik@gmail.com>
Acked-by: David Kershner <david.kershner@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/visorinput/visorinput.c

@@ -727,18 +727,8 @@ static struct visor_driver visorinput_driver = {
 	.resume = visorinput_resume,
 };
 
-static int visorinput_init(void)
-{
-	return visorbus_register_visor_driver(&visorinput_driver);
-}
-
-static void visorinput_cleanup(void)
-{
-	visorbus_unregister_visor_driver(&visorinput_driver);
-}
-
-module_init(visorinput_init);
-module_exit(visorinput_cleanup);
+module_driver(visorinput_driver, visorbus_register_visor_driver,
+	      visorbus_unregister_visor_driver);
 
 MODULE_DEVICE_TABLE(visorbus, visorinput_channel_types);