dmaengine: PL08x: fix missed dma_transfer_direction fixup

db8196df (dmaengine: move drivers to dma_transfer_direction) missed
fixing up the "DMA_NONE" case.
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Tested-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

drivers/dma/amba-pl08x.c

@@ -1287,7 +1287,7 @@ static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy(
 	}
 	list_add_tail(&dsg->node, &txd->dsg_list);
 
-	txd->direction = DMA_NONE;
+	txd->direction = DMA_MEM_TO_MEM;
 	dsg->src_addr = src;
 	dsg->dst_addr = dest;
 	dsg->len = len;