dma: edma: Declare DMA_SLAVE_BUSWIDTH_3_BYTES as supported buswidth

eDMA can be configured for 3bytes word size for source and destination.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/dma/edma.c

@@ -982,6 +982,7 @@ static void __init edma_chan_init(struct edma_cc *ecc,
 
 #define EDMA_DMA_BUSWIDTHS	(BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
 				 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
+				 BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \
 				 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
 
 static int edma_dma_device_slave_caps(struct dma_chan *dchan,