ASoC: rt1316: fix key tone missing

ASoC: rt1316: fix key tone missing

This patch adds a control that there are three options to control the digital volume output.
The user could select "immediately" to make volume updates immediately
and avoid key tone missing issues.
In default, the driver selects that the volume update when a zero-crossing with a soft ramp.

Signed-off-by: Shuming Fan <shumingf@realtek.com>
Reported-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
Link: https://lore.kernel.org/r/20230726091051.658754-1-shumingf@realtek.com
Signed-off-by: Mark Brown <broonie@kernel.org>