QTI USB Audio QMI Device

USB Audio QMI device is used to attach to remote processor IOMMU and
map USB Audio driver specific memory to iova to share with remote
processor.

Required Properties:

- compatible : "qcom,usb-audio-qmi-dev"

- iommus : A list of phandle and IOMMU specifier pairs that describe the
  IOMMU master interfaces of the device.

- qcom,usb-audio-stream-id : Stream id is prepended to iova before passing
  iova to remote processor. This allows remote processor to access iova.

- qcom,usb-audio-intr-num : Interrupter number for external sub system
  destination.

Example:
	usb_audio_qmi_dev {
		compatible = "qcom,usb-audio-qmi-dev";
		iommus = <&lpass_q6_smmu 12>;
		qcom,usb-audio-stream-id = <12>;
		qcom,usb-audio-intr-num = <1>;
	};
