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>;
};