dt-bindings: thermal: Add qmi sensor bindings

QMI thermal mitigation(TS) sensor.

The QMI TS Sensor driver can list the sensors that are available in the

remote subsystem. This driver can read the temperature, set threshold and

get threshold notification.

Each child node of the QMI TS devicetree node represents a remote

subsystem and it can have more than one remote sensor names.

Properties:

- compatible:

	Usage: required

	Value type: <string>

	Definition: should be "qcom,qmi-sensors"

- #thermal-sensor-cells:

	Usage: required

	Value type: <integer>

	Definition: Must be 1. See thermal.txt for description.

Subsystem properties:

- qcom,instance-id:

	Usage: required

	Value type: <integer>

	Definition: Remote subsystem QMI server instance id to be used for

			communicating with QMI.

- qcom,qmi-sensor-names:

	Usage: required

	Value type: <array of string>

	Definition: Remote sensor names. Below strings

		are the only acceptable sensor names,

		1. pa

		2. pa1

		3. qfe_pa0

		4. qfe_wtr0

Example:

qmi_sensor: qmi-ts-sensors {

	compatible = "qcom,qmi-sensors";

	#thermal-sensor-cells = <1>;

	modem {

		qcom,instance-id = <0x0>;

		qcom,qmi-sensor-names = "pa",

					"pa_1",

					"qfe_pa0",

					"qfe_wtr0";

	};

};