ASoC: Convert mxs directory to module_platform_driver

Factor out some boilerplate code.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Dong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/mxs/mxs-sgtl5000.c b/sound/soc/mxs/mxs-sgtl5000.c
index 7fbeaec..200a928 100644
--- a/sound/soc/mxs/mxs-sgtl5000.c
+++ b/sound/soc/mxs/mxs-sgtl5000.c
@@ -156,17 +156,7 @@
 	.remove = __devexit_p(mxs_sgtl5000_remove),
 };
 
-static int __init mxs_sgtl5000_init(void)
-{
-	return platform_driver_register(&mxs_sgtl5000_audio_driver);
-}
-module_init(mxs_sgtl5000_init);
-
-static void __exit mxs_sgtl5000_exit(void)
-{
-	platform_driver_unregister(&mxs_sgtl5000_audio_driver);
-}
-module_exit(mxs_sgtl5000_exit);
+module_platform_driver(mxs_sgtl5000_audio_driver);
 
 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
 MODULE_DESCRIPTION("MXS ALSA SoC Machine driver");