ASoC: cs35l56: Move utility functions to shared file

Move the cs35l56 utility functions into the shared file so they are
available for use in HDA.

Signed-off-by: Simon Trimmer <simont@opensource.cirrus.com>
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230721132120.5523-5-rf@opensource.cirrus.com


Signed-off-by: Mark Brown <broonie@kernel.org>