ASoC: soc-pcm: merge DPCM and non-DPCM validation check

DPCM and non-DPCM validation check are very similar. The big difference
is that DPCM doesn't check Codec validation. This is historical reason.
It should be checked, but it breaks existing driver/behavior.

Anyway, if we uses dummy DAI as Codec when DPCM case, there is no
difference between DPCM and non-DPCM. Let's merge these.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://patch.msgid.link/8734kq9vgq.wl-kuninori.morimoto.gx@renesas.com


Signed-off-by: Mark Brown <broonie@kernel.org>