ALSA: jack: Expose injection debugfs at device register phase

Currently we add debugfs interfaces for jack injection (with
CONFIG_SND_JACK_INJECTION_DEBUG) at creating jack kctls in
snd_jack_kctl_add().  This means that those debugfs interfaces are
already exposed to user-space at the early probe phase -- that is, it
allows user-space already fiddling with it, while other components are
still being initialized and hidden until snd_card_register().
Depending on the driver implementation, such behavior can be an
unpleasant surprise.

For aligning the device exposure behavior, move the debugfs
registration at the device register phase, too.  snd_jack_kctl_add()
may still add the corresponding debugfs interfaces (for the
dynamically added jacks, if any), but it's done only conditionally
after the card has been registered.

Reviewed-by: Cen Zhang <zzzccc427@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20261016140653.4406-1-tiwai@suse.de

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