spi: ingenic: convert not to use dma_request_slave_channel()

dma_request_slave_channel() is deprecated. dma_request_chan() should
be used directly instead.

Switch to the preferred function and update the error handling accordingly.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/1c88236b5d6bff0af902492ea9e066c8cb0dfef5.1700391566.git.christophe.jaillet@wanadoo.frSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-ingenic.c

@@ -346,14 +346,17 @@ static bool spi_ingenic_can_dma(struct spi_controller *ctlr,
 static int spi_ingenic_request_dma(struct spi_controller *ctlr,
 				   struct device *dev)
 {
-	ctlr->dma_tx = dma_request_slave_channel(dev, "tx");
-	if (!ctlr->dma_tx)
-		return -ENODEV;
+	struct dma_chan *chan;
 
-	ctlr->dma_rx = dma_request_slave_channel(dev, "rx");
+	chan = dma_request_chan(dev, "tx");
+	if (IS_ERR(chan))
+		return PTR_ERR(chan);
+	ctlr->dma_tx = chan;
 
-	if (!ctlr->dma_rx)
-		return -ENODEV;
+	chan = dma_request_chan(dev, "rx");
+	if (IS_ERR(chan))
+		return PTR_ERR(chan);
+	ctlr->dma_rx = chan;
 
 	ctlr->can_dma = spi_ingenic_can_dma;