ASoC: soc-pcm: do cpu_dai related operation at same place

cpu_dai related operation is separated by component operation at
soc_pcm_hw_params() somehow.
It is not readable, let's do it at same place

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