ASoC: soc-dapm: don't use rtd->cpu_dai on for_each_rtd_cpu_dai()

soc_dapm_stream_event() is using for_each_rtd_cpu_dais().
It should use "cpu_dai", instead of "rtd->cpu_dai".
This patch fixup it.

Fixes: commit de6214a336 ("ASoC: Add multiple CPU DAI support in DAPM")
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87pne07qeh.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-dapm.c

@@ -4438,7 +4438,7 @@ static void soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
 	int i;
 
 	for_each_rtd_cpu_dai(rtd, i, cpu_dai)
-		soc_dapm_dai_stream_event(rtd->cpu_dai, stream, event);
+		soc_dapm_dai_stream_event(cpu_dai, stream, event);
 	for_each_rtd_codec_dai(rtd, i, codec_dai)
 		soc_dapm_dai_stream_event(codec_dai, stream, event);