Input: mouse - use macro module_platform_driver()

Commit 940ab88962bc1aff3273a8356d64577a6e386736 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>
diff --git a/drivers/input/mouse/gpio_mouse.c b/drivers/input/mouse/gpio_mouse.c
index 58902fb..a9ad8e1 100644
--- a/drivers/input/mouse/gpio_mouse.c
+++ b/drivers/input/mouse/gpio_mouse.c
@@ -178,18 +178,7 @@
 		.owner	= THIS_MODULE,
 	}
 };
-
-static int __init gpio_mouse_init(void)
-{
-	return platform_driver_register(&gpio_mouse_device_driver);
-}
-module_init(gpio_mouse_init);
-
-static void __exit gpio_mouse_exit(void)
-{
-	platform_driver_unregister(&gpio_mouse_device_driver);
-}
-module_exit(gpio_mouse_exit);
+module_platform_driver(gpio_mouse_device_driver);
 
 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
 MODULE_DESCRIPTION("GPIO mouse driver");