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/pcm3008.c b/sound/soc/codecs/pcm3008.c
index f731651..b12d01f 100644
--- a/sound/soc/codecs/pcm3008.c
+++ b/sound/soc/codecs/pcm3008.c
@@ -172,17 +172,7 @@
 	},
 };
 
-static int __init pcm3008_modinit(void)
-{
-	return platform_driver_register(&pcm3008_codec_driver);
-}
-module_init(pcm3008_modinit);
-
-static void __exit pcm3008_exit(void)
-{
-	platform_driver_unregister(&pcm3008_codec_driver);
-}
-module_exit(pcm3008_exit);
+module_platform_driver(pcm3008_codec_driver);
 
 MODULE_DESCRIPTION("Soc PCM3008 driver");
 MODULE_AUTHOR("Hugo Villeneuve");