ASoC: dt-bindings: qcom,msm8916-wcd-digital-codec: convert to dtschema

Convert the Qualcomm MSM8916 WCD Digital Audio Codec bindings from text
to yaml dt schema format.
Make bindings complete by adding #sound-dai-cells.

Signed-off-by: Rayyan Ansari <rayyan.ansari@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240710113833.39859-2-rayyan.ansari@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>