ASoC: samsung: Add DT support for i2s

Add support for device based discovery.

Signed-off-by: Padmavathi Venna <padma.v@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/samsung/dma.h b/sound/soc/samsung/dma.h
index 73d8c7c..189a7a6 100644
--- a/sound/soc/samsung/dma.h
+++ b/sound/soc/samsung/dma.h
@@ -19,6 +19,7 @@
 	int dma_size;			/* Size of the DMA transfer */
 	unsigned ch;
 	struct samsung_dma_ops *ops;
+	char *ch_name;
 };
 
 int asoc_dma_platform_register(struct device *dev);