ASoC: dt-bindings: fsl-esai: Convert fsl,esai.txt to yaml

Convert fsl,esai.txt to yaml. So DTB_CHECK tools can verify dts file about
esai part.

clock-names 'spba' is optional according to description. So minItems of
clocks and clock-names is 3.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://msgid.link/r/20240322145406.2613256-1-Frank.Li@nxp.com


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