ASoC: dt-bindings: cirrus,cs42xx8: Convert to dtschema

Convert the Cirrus Logic CS42448/CS42888 audio CODEC bindings to DT
schema format. Set power supply properties to required only for CS42888.

Cc: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Animesh Agarwal <animeshagarwal28@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20240710072756.99765-1-animeshagarwal28@gmail.com


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