Staging: most: Use module_i2c_driver

Macro module_i2c_driver is used for drivers whose init
and exit paths does only register and unregister to i2c
API. Remove some boilerplate code by using module_i2c_driver.

Problem found using Coccinelle.

Signed-off-by: Shraddha Barke <shraddha.6596@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>