ASoC: rcar: Fix dma direction type

dmaengine_prep_slave_single() expects a enum dma_transfer_direction and not a
enum dma_data_direction. Since the integer representations of both DMA_TO_DEVICE
and DMA_MEM_TO_DEV aswell as DMA_FROM_DEVICE and DMA_DEV_TO_MEM have the same
value the code worked fine even though it was using the wrong type.

Fixes the following warning from sparse:
	sound/soc/sh/rcar/core.c:227:49: warning: mixing different enum types
	sound/soc/sh/rcar/core.c:227:49:     int enum dma_data_direction  versus
	sound/soc/sh/rcar/core.c:227:49:     int enum dma_transfer_direction

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/sh/rcar/core.c

@@ -363,7 +363,7 @@ int rsnd_dma_init(struct rsnd_priv *priv, struct rsnd_dma *dma,
 	if (ret < 0)
 		goto rsnd_dma_init_err;
 
-	dma->dir = is_play ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
+	dma->dir = is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
 	INIT_WORK(&dma->work, rsnd_dma_do_work);
 
 	return 0;

sound/soc/sh/rcar/rsnd.h

@@ -158,7 +158,7 @@ struct rsnd_dma {
 	struct sh_dmae_slave	slave;
 	struct work_struct	work;
 	struct dma_chan		*chan;
-	enum dma_data_direction dir;
+	enum dma_transfer_direction dir;
 
 	int submit_loop;
 	int offset; /* it cares A/B plane */