ASoC: Convert blackfin directory to module_platform_driver

Factor out some boilerplate code.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/blackfin/bf5xx-i2s-pcm.c b/sound/soc/blackfin/bf5xx-i2s-pcm.c
index 7565e15..6ec3d41 100644
--- a/sound/soc/blackfin/bf5xx-i2s-pcm.c
+++ b/sound/soc/blackfin/bf5xx-i2s-pcm.c
@@ -314,17 +314,7 @@
 	.remove = __devexit_p(bfin_i2s_soc_platform_remove),
 };
 
-static int __init snd_bfin_i2s_pcm_init(void)
-{
-	return platform_driver_register(&bfin_i2s_pcm_driver);
-}
-module_init(snd_bfin_i2s_pcm_init);
-
-static void __exit snd_bfin_i2s_pcm_exit(void)
-{
-	platform_driver_unregister(&bfin_i2s_pcm_driver);
-}
-module_exit(snd_bfin_i2s_pcm_exit);
+module_platform_driver(bfin_i2s_pcm_driver);
 
 MODULE_AUTHOR("Cliff Cai");
 MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");