ALSA: i2c: ak4xxx-adda: implement AK4529 reset handling

Delta 410 uses snd_akm4xxx_reset() both around DFS changes and from
its PM callbacks, but the AK4529 case in this helper is still left
unimplemented and never drives the codec reset path.

The AK4529 datasheet documents register 09h.RSTN as an internal
timing reset. Clearing RSTN powers down the ADC and DAC blocks, but
does not reinitialize the register map. That matches the existing
ak4xxx helper model, which already keeps the desired codec state in
the software register cache.

Implement AK4529 reset handling by clearing 09h.RSTN on state == 1,
then replaying the cached register image and setting RSTN back to 1
on state == 0.

This restores cached Delta 410 mixer state after resume and gives
the AK4529 DFS-change path a real codec reset sequence.

Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com>
Link: https://patch.msgid.link/20260407-ak4529-reset-handling-v1-1-b971c18b1a32@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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