ASoC: dt-bindings: qcom,q6core: remove binding

qcom,q6core is already described in soc/qcom/qcom,apr.yaml.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220906121110.301900-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/qcom,q6core.txt

-Qualcomm ADSP Core service binding
-
-Q6CORE 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 the apr service device.
-
-- but must contain the following property:
-
-- compatible:
-	Usage: required
-	Value type: <stringlist>
-	Definition: must be "qcom,q6core-v<MAJOR-NUMBER>.<MINOR-NUMBER>".
-		   Or "qcom,q6core" where the version number can be queried
-		   from DSP.
-		   example "qcom,q6core-v2.0"
-
-= EXAMPLE
-apr-service@3 {
-	compatible = "qcom,q6core";
-	reg = <APR_SVC_ADSP_CORE>;
-};