fotg210-udc: remove a bogus dma_sync_single_for_device call

dma_map_single already transfers ownership to the device.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/gadget/udc/fotg210-udc.c

@@ -356,10 +356,6 @@ static void fotg210_start_dma(struct fotg210_ep *ep,
 		return;
 	}
 
-	dma_sync_single_for_device(NULL, d, length,
-				   ep->dir_in ? DMA_TO_DEVICE :
-					DMA_FROM_DEVICE);
-
 	fotg210_enable_dma(ep, d, length);
 
 	/* check if dma is done */