ASoC: Convert pxa directory to module_platform_driver

Factor out some boilerplate code.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Marek Vasut <marek.vasut@gmail.com>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/pxa/pxa2xx-pcm.c b/sound/soc/pxa/pxa2xx-pcm.c
index 600676f..fdd6bed 100644
--- a/sound/soc/pxa/pxa2xx-pcm.c
+++ b/sound/soc/pxa/pxa2xx-pcm.c
@@ -141,17 +141,7 @@
 	.remove = __devexit_p(pxa2xx_soc_platform_remove),
 };
 
-static int __init snd_pxa_pcm_init(void)
-{
-	return platform_driver_register(&pxa_pcm_driver);
-}
-module_init(snd_pxa_pcm_init);
-
-static void __exit snd_pxa_pcm_exit(void)
-{
-	platform_driver_unregister(&pxa_pcm_driver);
-}
-module_exit(snd_pxa_pcm_exit);
+module_platform_driver(pxa_pcm_driver);
 
 MODULE_AUTHOR("Nicolas Pitre");
 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");