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/sn95031.c b/sound/soc/codecs/sn95031.c
index 65f2ef9..f99baa0 100644
--- a/sound/soc/codecs/sn95031.c
+++ b/sound/soc/codecs/sn95031.c
@@ -920,19 +920,7 @@
 	.remove		= __devexit_p(sn95031_device_remove),
 };
 
-static int __init sn95031_init(void)
-{
-	pr_debug("driver init called\n");
-	return platform_driver_register(&sn95031_codec_driver);
-}
-module_init(sn95031_init);
-
-static void __exit sn95031_exit(void)
-{
-	pr_debug("driver exit called\n");
-	platform_driver_unregister(&sn95031_codec_driver);
-}
-module_exit(sn95031_exit);
+module_platform_driver(sn95031_codec_driver);
 
 MODULE_DESCRIPTION("ASoC TI SN95031 codec driver");
 MODULE_AUTHOR("Vinod Koul <vinod.koul@intel.com>");