The kcontrol put callback is expected to return 1 when there is change
in HW or when the update is acknowledged by driver. This would ensure
that change notifications are sent to subscribed applications. Update
the DSPK driver accordingly.

Fixes: 327ef647 ("ASoC: tegra: Add Tegra186 based DSPK driver")
Suggested-by: NJaroslav Kysela <perex@perex.cz>
Suggested-by: NMark Brown <broonie@kernel.org>
Signed-off-by: NSameer Pujar <spujar@nvidia.com>
Reviewed-by: NTakashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/1637219231-406-11-git-send-email-spujar@nvidia.comSigned-off-by: NMark Brown <broonie@kernel.org>