Now all needed callers have been replaced with *_locked() versions,
let's turn on the locking in snd_ctl_find_id() and
snd_ctl_find_numid().

This patch also adds the lockdep assertions for debugging, too.

Link: https://lore.kernel.org/r/20230718141304.1032-11-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>