ASoC: soc-card: Use snd_ctl_find_id_mixer() instead of open-coding

Use the snd_ctl_find_id_mixer[_locked]() wrapper in
snd_soc_card_get_kcontrol[_locked]() instead of open-coding a custom
list walk of the card controls list.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Link: https://msgid.link/r/20240401100210.61277-3-rf@opensource.cirrus.com


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