ASoC: rsnd: cleanup rsnd_dai_of_node()

It calls rsnd_dai_of_node() to know it was called from Audio Graph
Card/Card2, or from Simple Audio Card. And after that, it gets
number of related DAIs.

To be more simple code, this patch merges these.
This is prepare for multi Component support.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87v8eab1md.wl-kuninori.morimoto.gx@renesas.com


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