ASoC: Convert au1x directory to module_platform_driver

Factor out some boilerplate code.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/au1x/dma.c b/sound/soc/au1x/dma.c
index 177f713..dc4dae4 100644
--- a/sound/soc/au1x/dma.c
+++ b/sound/soc/au1x/dma.c
@@ -359,18 +359,7 @@
 	.remove		= __devexit_p(alchemy_pcm_drvremove),
 };
 
-static int __init alchemy_pcmdma_load(void)
-{
-	return platform_driver_register(&alchemy_pcmdma_driver);
-}
-
-static void __exit alchemy_pcmdma_unload(void)
-{
-	platform_driver_unregister(&alchemy_pcmdma_driver);
-}
-
-module_init(alchemy_pcmdma_load);
-module_exit(alchemy_pcmdma_unload);
+module_platform_driver(alchemy_pcmdma_driver);
 
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Au1000/Au1500/Au1100 Audio DMA driver");