ASoC: tegra: 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/b78685e4103f12931ddb09c1654bc6b04b640868.1699724240.git.christophe.jaillet@wanadoo.frSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/tegra/tegra_pcm.c

@@ -98,8 +98,8 @@ int tegra_pcm_open(struct snd_soc_component *component,
 		return ret;
 	}
 
-	chan = dma_request_slave_channel(cpu_dai->dev, dmap->chan_name);
-	if (!chan) {
+	chan = dma_request_chan(cpu_dai->dev, dmap->chan_name);
+	if (IS_ERR(chan)) {
 		dev_err(cpu_dai->dev,
 			"dmaengine request slave channel failed! (%s)\n",
 			dmap->chan_name);