ASoC: dt-bindings: qcom,q6afe: remove binding

qcom,q6afe is already documented in soc/qcom/qcom,apr.yaml.  The
version-based compatibles ("qcom,q6afe-v<MAJOR-NUMBER>.<MINOR-NUMBER>")
are not used (neither in upstream nor in downstream DTS).

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Acked-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>