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 <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220910090856.49271-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/qcom,q6afe.txt

-Qualcomm Audio Front End (Q6AFE) binding
-
-AFE is one of the APR audio service on Q6DSP
-Please refer to qcom,apr.txt for details of the common apr service bindings
-used by all apr services. Must contain the following properties.
-
-- compatible:
-	Usage: required
-	Value type: <stringlist>
-	Definition: must be "qcom,q6afe-v<MAJOR-NUMBER>.<MINOR-NUMBER>"
-		  Or "qcom,q6afe" where the version number can be queried
-		  from DSP.
-		  example "qcom,q6afe"
-
-= EXAMPLE
-
-apr-service@4 {
-	compatible = "qcom,q6afe";
-	reg = <APR_SVC_AFE>;
-};