ASoC: soc-dai: add snd_soc_dai_suspend()

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

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87muh6hn2x.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-dai.c

@@ -353,3 +353,9 @@ snd_pcm_sframes_t snd_soc_dai_delay(struct snd_soc_dai *dai,
 
 	return delay;
 }
+
+void snd_soc_dai_suspend(struct snd_soc_dai *dai)
+{
+	if (dai->driver->suspend)
+		dai->driver->suspend(dai);
+}