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/mpu3050.c b/drivers/input/misc/mpu3050.c
index 208d1a1..5403c57 100644
--- a/drivers/input/misc/mpu3050.c
+++ b/drivers/input/misc/mpu3050.c
@@ -475,17 +475,7 @@
 	.id_table	= mpu3050_ids,
 };
 
-static int __init mpu3050_init(void)
-{
-	return i2c_add_driver(&mpu3050_i2c_driver);
-}
-module_init(mpu3050_init);
-
-static void __exit mpu3050_exit(void)
-{
-	i2c_del_driver(&mpu3050_i2c_driver);
-}
-module_exit(mpu3050_exit);
+module_i2c_driver(mpu3050_i2c_driver);
 
 MODULE_AUTHOR("Wistron Corp.");
 MODULE_DESCRIPTION("MPU3050 Tri-axis gyroscope driver");