ASoC: dt-bindings: atmel,sam9x5-wm8731: Convert to json-schema

Convert atmel sam9x5-wm8731-audio devicetree binding to json-schema.

Signed-off-by: Dharma Balasubiramani <dharma.b@microchip.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240206064418.237377-1-dharma.b@microchip.com


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