platform-drivers-x86: convert drivers/platform/x86/* to use module_platform_driver()

This patch converts the drivers in drivers/platform/x86/* to use the
module_platform_driver() macro which makes the code smaller and a bit
simpler.

Cc: Hong Liu <hong.liu@intel.com>
Cc: Durgadoss R <durgadoss.r@intel.com>
Cc: Daniel Drake <dsd@laptop.org>
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

drivers/platform/x86/xo1-rfkill.c

@@ -67,19 +67,8 @@ static struct platform_driver xo1_rfkill_driver = {
 	.remove		= __devexit_p(xo1_rfkill_remove),
 };
 
-static int __init xo1_rfkill_init(void)
-{
-	return platform_driver_register(&xo1_rfkill_driver);
-}
-
-static void __exit xo1_rfkill_exit(void)
-{
-	platform_driver_unregister(&xo1_rfkill_driver);
-}
+module_platform_driver(xo1_rfkill_driver);
 
 MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:xo1-rfkill");
-
-module_init(xo1_rfkill_init);
-module_exit(xo1_rfkill_exit);