ALSA: hda: Remove unused snd_hda_add_nid

snd_hda_add_nid() last use was removed in 2014 by
commit db8e8a9d ("ALSA: hda - Remove the obsoleted static quirk codes
from patch_cmedia.c")

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://patch.msgid.link/20250505010922.340534-1-linux@treblig.org


Signed-off-by: Takashi Iwai <tiwai@suse.de>