ASoC: renesas: rz-ssi: Remove the rz_ssi_get_dai() function

Remove the rz_ssi_get_dai() function and use directly the
snd_soc_rtd_to_cpu() where needed or the struct device pointer embedded
in the struct rz_ssi_priv objects.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://patch.msgid.link/20241210170953.2936724-9-claudiu.beznea.uj@bp.renesas.com


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