Input: convert I2C drivers to use module_i2c_driver()

This patch converts the drivers in drivers/input/* to use the
module_i2c_driver() macro which makes the code smaller and a bit
simpler.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index a596c27..19d4ea6 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -1267,18 +1267,7 @@
 	.id_table	= mxt_id,
 };
 
-static int __init mxt_init(void)
-{
-	return i2c_add_driver(&mxt_driver);
-}
-
-static void __exit mxt_exit(void)
-{
-	i2c_del_driver(&mxt_driver);
-}
-
-module_init(mxt_init);
-module_exit(mxt_exit);
+module_i2c_driver(mxt_driver);
 
 /* Module information */
 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");