ASoC: Intel: nuvoton-common: support nau8318 amplifier

Implement nau8318 support code in this common module so it could be
shared between multiple SOF machine drivers.

Signed-off-by: Brent Lu <brent.lu@intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20230915124852.1696857-14-yung-chuan.liao@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>