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 de6214a3 ("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>