mfd: Convert MFD drivers to use module_platform_driver

Factors out some boilerplate code for drivers doing the default thing
for platform driver registration. Drivers using platform_driver_probe
or an initcall other than module_init can't be converted.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/t7l66xb.c b/drivers/mfd/t7l66xb.c
index 91ad21e..2d9e879 100644
--- a/drivers/mfd/t7l66xb.c
+++ b/drivers/mfd/t7l66xb.c
@@ -442,21 +442,7 @@
 
 /*--------------------------------------------------------------------------*/
 
-static int __init t7l66xb_init(void)
-{
-	int retval = 0;
-
-	retval = platform_driver_register(&t7l66xb_platform_driver);
-	return retval;
-}
-
-static void __exit t7l66xb_exit(void)
-{
-	platform_driver_unregister(&t7l66xb_platform_driver);
-}
-
-module_init(t7l66xb_init);
-module_exit(t7l66xb_exit);
+module_platform_driver(t7l66xb_platform_driver);
 
 MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
 MODULE_LICENSE("GPL v2");