usb: renesas_usbhs: Use dma_request_chan() directly for channel request

dma_request_slave_channel_reason() is:
#define dma_request_slave_channel_reason(dev, name) \
	dma_request_chan(dev, name)
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20191113094838.2141-1-peter.ujfalusi@ti.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/renesas_usbhs/fifo.c

@@ -1273,11 +1273,11 @@ static void usbhsf_dma_init_dt(struct device *dev, struct usbhs_fifo *fifo,
 	 */
 	snprintf(name, sizeof(name), "ch%d", channel);
 	if (channel & 1) {
-		fifo->tx_chan = dma_request_slave_channel_reason(dev, name);
+		fifo->tx_chan = dma_request_chan(dev, name);
 		if (IS_ERR(fifo->tx_chan))
 			fifo->tx_chan = NULL;
 	} else {
-		fifo->rx_chan = dma_request_slave_channel_reason(dev, name);
+		fifo->rx_chan = dma_request_chan(dev, name);
 		if (IS_ERR(fifo->rx_chan))
 			fifo->rx_chan = NULL;
 	}