ASoC: dt-bindings: atmel-classd: PDMIC convert to json-schema

Convert Atmel PDMIC devicetree binding to json-schema.
Change file naming to match json-schema naming.

Signed-off-by: Ryan Wanner <Ryan.Wanner@microchip.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220715162922.660859-3-Ryan.Wanner@microchip.com


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