ASoC: samsung: Rename DMA platform registration functions

The current naming with a simple asoc_ prefix is too generic for use in
multiplatform kernels.

Signed-off-by: Mark Brown <broonie@linaro.org>
Acked-by: Sangbeom Kim <sbkim73@samsung.com>
diff --git a/sound/soc/samsung/dma.h b/sound/soc/samsung/dma.h
index 189a7a6..0e86315 100644
--- a/sound/soc/samsung/dma.h
+++ b/sound/soc/samsung/dma.h
@@ -22,7 +22,7 @@
 	char *ch_name;
 };
 
-int asoc_dma_platform_register(struct device *dev);
-void asoc_dma_platform_unregister(struct device *dev);
+int samsung_asoc_dma_platform_register(struct device *dev);
+void samsung_asoc_dma_platform_unregister(struct device *dev);
 
 #endif