dt: bindings: add ath10k wireless device

* Qualcomm Atheros ath10k wireless devices

For ath10k devices the calibration data can be provided through Device

Tree. The node is a child node of the PCI controller.

Required properties:

-compatible : Should be "qcom,ath10k"

Optional properties:

- qcom,ath10k-calibration-data : calibration data as an array, the

				 length can vary between hw versions

Example:

pci {

	pcie@0 {

		reg = <0 0 0 0 0>;

		#interrupt-cells = <1>;

		#size-cells = <2>;

		#address-cells = <3>;

		device_type = "pci";

		ath10k@0,0 {

			reg = <0 0 0 0 0>;

			device_type = "pci";

			qcom,ath10k-calibration-data = [ 01 02 03 ... ];

		};

	};

};