ASoC: cs42l42: Export some functions for SoundWire

Export functions that will be needed by a SoundWire module.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20230127165111.3010960-6-sbinding@opensource.cirrus.com


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