Input: keyboard - 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/keyboard/twl4030_keypad.c b/drivers/input/keyboard/twl4030_keypad.c
index a26922c..a588578 100644
--- a/drivers/input/keyboard/twl4030_keypad.c
+++ b/drivers/input/keyboard/twl4030_keypad.c
@@ -460,18 +460,7 @@
 		.owner	= THIS_MODULE,
 	},
 };
-
-static int __init twl4030_kp_init(void)
-{
-	return platform_driver_register(&twl4030_kp_driver);
-}
-module_init(twl4030_kp_init);
-
-static void __exit twl4030_kp_exit(void)
-{
-	platform_driver_unregister(&twl4030_kp_driver);
-}
-module_exit(twl4030_kp_exit);
+module_platform_driver(twl4030_kp_driver);
 
 MODULE_AUTHOR("Texas Instruments");
 MODULE_DESCRIPTION("TWL4030 Keypad Driver");