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/wm9712.c b/sound/soc/codecs/wm9712.c
index fd18127..4ce73f5 100644
--- a/sound/soc/codecs/wm9712.c
+++ b/sound/soc/codecs/wm9712.c
@@ -694,17 +694,7 @@
 	.remove = __devexit_p(wm9712_remove),
 };
 
-static int __init wm9712_init(void)
-{
-	return platform_driver_register(&wm9712_codec_driver);
-}
-module_init(wm9712_init);
-
-static void __exit wm9712_exit(void)
-{
-	platform_driver_unregister(&wm9712_codec_driver);
-}
-module_exit(wm9712_exit);
+module_platform_driver(wm9712_codec_driver);
 
 MODULE_DESCRIPTION("ASoC WM9711/WM9712 driver");
 MODULE_AUTHOR("Liam Girdwood");