ASoC: adau1372: add support for S24_LE mode

The ADAU1372 contains 24bit ADCs and DACs. Allow the driver to use
its native mode which uses the same settings as the current 32 bit
mode.

Signed-off-by: Maarten Zanders <maarten.zanders@mind.be>
Link: https://lore.kernel.org/r/20221028152626.109603-3-maarten.zanders@mind.be


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