ASoC: Intel: sof_rt1308: move rt1308 code to common module

ASoC: Intel: sof_rt1308: move rt1308 code to common module

Move the code related to rt1308 dai link to the realtek common module.
It creates a clean base to add more amplifier support to this machine
driver in the future.

Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Brent Lu <brent.lu@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220301194903.60859-6-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>