iio: mlx90614: Add devicetree bindings documentation

Also introduce "melexis" as a vendor prefix for device tree bindings.
Signed-off-by: Vianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Documentation/devicetree/bindings/iio/temperature/mlx90614.txt

+* Melexis MLX90614 contactless IR temperature sensor
+
+http://melexis.com/Infrared-Thermometer-Sensors/Infrared-Thermometer-Sensors/MLX90614-615.aspx
+
+Required properties:
+
+  - compatible: should be "melexis,mlx90614"
+  - reg: the I2C address of the sensor
+
+Example:
+
+mlx90614@5a {
+	compatible = "melexis,mlx90614";
+	reg = <0x5a>;
+};

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -110,6 +110,7 @@ lltc	Linear Technology Corporation
 marvell	Marvell Technology Group Ltd.
 maxim	Maxim Integrated Products
 mediatek	MediaTek Inc.
+melexis	Melexis N.V.
 merrii	Merrii Technology Co., Ltd.
 micrel	Micrel Inc.
 microchip	Microchip Technology Inc.