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/twl4030.c b/sound/soc/codecs/twl4030.c
index 2a3a528..61d8a90 100644
--- a/sound/soc/codecs/twl4030.c
+++ b/sound/soc/codecs/twl4030.c
@@ -2294,17 +2294,7 @@
 	},
 };
 
-static int __init twl4030_modinit(void)
-{
-	return platform_driver_register(&twl4030_codec_driver);
-}
-module_init(twl4030_modinit);
-
-static void __exit twl4030_exit(void)
-{
-	platform_driver_unregister(&twl4030_codec_driver);
-}
-module_exit(twl4030_exit);
+module_platform_driver(twl4030_codec_driver);
 
 MODULE_DESCRIPTION("ASoC TWL4030 codec driver");
 MODULE_AUTHOR("Steve Sakoman");