ASoC: Convert CODEC drivers to module_platform_driver

Factors out a bit of boilerplate.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/stac9766.c b/sound/soc/codecs/stac9766.c
index e4783a4..5581953 100644
--- a/sound/soc/codecs/stac9766.c
+++ b/sound/soc/codecs/stac9766.c
@@ -408,17 +408,7 @@
 	.remove = __devexit_p(stac9766_remove),
 };
 
-static int __init stac9766_init(void)
-{
-	return platform_driver_register(&stac9766_codec_driver);
-}
-module_init(stac9766_init);
-
-static void __exit stac9766_exit(void)
-{
-	platform_driver_unregister(&stac9766_codec_driver);
-}
-module_exit(stac9766_exit);
+module_platform_driver(stac9766_codec_driver);
 
 MODULE_DESCRIPTION("ASoC stac9766 driver");
 MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>");