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/dmic.c b/sound/soc/codecs/dmic.c
index 6fae765..3e929f0 100644
--- a/sound/soc/codecs/dmic.c
+++ b/sound/soc/codecs/dmic.c
@@ -89,17 +89,7 @@
 	.remove = __devexit_p(dmic_dev_remove),
 };
 
-static int __init dmic_init(void)
-{
-	return platform_driver_register(&dmic_driver);
-}
-module_init(dmic_init);
-
-static void __exit dmic_exit(void)
-{
-	platform_driver_unregister(&dmic_driver);
-}
-module_exit(dmic_exit);
+module_platform_driver(dmic_driver);
 
 MODULE_DESCRIPTION("Generic DMIC driver");
 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");