ASoC: soc-pcm: add missing cpu_dai->rate = 0

Codec side is setting codec_dai->rate = 0 when error case
at soc_pcm_hw_params(), but there is not such setting for CPU side.
This patch adds it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>