ata: sata_dwc_460ex: DMA is always a flow controller

In the original code the DMA is always a flow controller. Set this accordingly
in updated code.
Tested-by: NChristian Lamparter <chunkeey@googlemail.com>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NTejun Heo <tj@kernel.org>

drivers/ata/sata_dwc_460ex.c

@@ -311,7 +311,7 @@ static struct dma_async_tx_descriptor *dma_dwc_xfer_setup(struct ata_queued_cmd
 
 	if (qc->dma_dir == DMA_DEV_TO_MEM) {
 		sconf.src_addr = addr;
-		sconf.device_fc = true;
+		sconf.device_fc = false;
 	} else {	/* DMA_MEM_TO_DEV */
 		sconf.dst_addr = addr;
 		sconf.device_fc = false;