ASoC: sof: pcm: use snd_pcm_direction_name()

We already have snd_pcm_direction_name(). Let's use it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://patch.msgid.link/87mslzk51h.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/pcm.c

@@ -100,7 +100,7 @@ sof_pcm_setup_connected_widgets(struct snd_sof_dev *sdev, struct snd_soc_pcm_run
 							     dpcm_end_walk_at_be);
 		if (ret < 0) {
 			dev_err(sdev->dev, "error: dai %s has no valid %s path\n", dai->name,
-				dir == SNDRV_PCM_STREAM_PLAYBACK ? "playback" : "capture");
+				snd_pcm_direction_name(dir));
 			return ret;
 		}