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/twl6040.c b/sound/soc/codecs/twl6040.c
index 17930ed..a4a65dc 100644
--- a/sound/soc/codecs/twl6040.c
+++ b/sound/soc/codecs/twl6040.c
@@ -1620,17 +1620,7 @@
 	.remove = __devexit_p(twl6040_codec_remove),
 };
 
-static int __init twl6040_codec_init(void)
-{
-	return platform_driver_register(&twl6040_codec_driver);
-}
-module_init(twl6040_codec_init);
-
-static void __exit twl6040_codec_exit(void)
-{
-	platform_driver_unregister(&twl6040_codec_driver);
-}
-module_exit(twl6040_codec_exit);
+module_platform_driver(twl6040_codec_driver);
 
 MODULE_DESCRIPTION("ASoC TWL6040 codec driver");
 MODULE_AUTHOR("Misael Lopez Cruz");