Input: serio - use macro module_platform_driver()

Commit 940ab88962 introduced a new macro to
save some platform_driver boilerplate code. Use it.

Signed-off-by: JJ Ding <dgdunix@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/serio/rpckbd.c

@@ -143,16 +143,4 @@ static struct platform_driver rpckbd_driver = {
 		.owner	= THIS_MODULE,
 	},
 };
-
-static int __init rpckbd_init(void)
-{
-	return platform_driver_register(&rpckbd_driver);
-}
-
-static void __exit rpckbd_exit(void)
-{
-	platform_driver_unregister(&rpckbd_driver);
-}
-
-module_init(rpckbd_init);
-module_exit(rpckbd_exit);
+module_platform_driver(rpckbd_driver);