spi, serial: move to dma_transfer_direction

fixup usage of dma direction by introducing dma_transfer_direction,
this patch moves spi, serial drivers to use new enum

Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Alan Cox <alan@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@iki.fi>
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index dbd32a1..3683a69 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1207,7 +1207,7 @@
 		struct dma_async_tx_descriptor *desc;
 
 		desc = chan->device->device_prep_slave_sg(chan,
-			sg, 1, DMA_FROM_DEVICE, DMA_PREP_INTERRUPT);
+			sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
 
 		if (desc) {
 			s->desc_rx[i] = desc;
@@ -1322,7 +1322,7 @@
 	BUG_ON(!sg_dma_len(sg));
 
 	desc = chan->device->device_prep_slave_sg(chan,
-			sg, s->sg_len_tx, DMA_TO_DEVICE,
+			sg, s->sg_len_tx, DMA_MEM_TO_DEV,
 			DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 	if (!desc) {
 		/* switch to PIO */