ASoC: soc-dai: add snd_soc_dai_trigger()

Current ALSA SoC is directly using dai->driver->ops->xxx,
thus, it has deep nested bracket, and it makes code unreadable.
This patch adds new snd_soc_dai_trigger() and use it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87sgqyhn40.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-dai.c

@@ -318,3 +318,15 @@ int snd_soc_dai_prepare(struct snd_soc_dai *dai,
 
 	return ret;
 }
+
+int snd_soc_dai_trigger(struct snd_soc_dai *dai,
+			struct snd_pcm_substream *substream,
+			int cmd)
+{
+	int ret = 0;
+
+	if (dai->driver->ops->trigger)
+		ret = dai->driver->ops->trigger(substream, cmd, dai);
+
+	return ret;
+}