ASoC: cs42l42: Add include dependencies to cs42l42.h

Make cs42l42.h include the other headers it depends on instead of
assuming that the .c file already included them.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20220817122347.1356773-3-rf@opensource.cirrus.com


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