Bosch bmg160 3 Axis gyroscope sensor driver

Required properties:

 - compatible		: Should be "bosch,bmg160".
 - reg			: i2c slave address of the device.
 - vdd-supply		: Analog power supply needed to power device.
 - vi2c-supply		: Digital IO Power supply needed for I2C.

Example:
	bmg160@69 { /* Gyroscope sensor */
			compatible = "bosch,bmg160";
			reg = <0x69>;
			vdd-supply = <&pm8916_l17>;
			vi2c-supply = <&pm8916_l16>;
	};