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/misc/mma8450.c b/drivers/input/misc/mma8450.c
index 4d60080..873ebce 100644
--- a/drivers/input/misc/mma8450.c
+++ b/drivers/input/misc/mma8450.c
@@ -247,17 +247,7 @@
 	.id_table	= mma8450_id,
 };
 
-static int __init mma8450_init(void)
-{
-	return i2c_add_driver(&mma8450_driver);
-}
-module_init(mma8450_init);
-
-static void __exit mma8450_exit(void)
-{
-	i2c_del_driver(&mma8450_driver);
-}
-module_exit(mma8450_exit);
+module_i2c_driver(mma8450_driver);
 
 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
 MODULE_DESCRIPTION("MMA8450 3-Axis Accelerometer Driver");