InvenSense MPU30X0-series gyrometer driver

Required properties:

 - compatible		: Should be "invn,mpu3050".
 - reg				: i2c slave address of the device.
 - interrupt-parent	: Parent of interrupt.
 - interrupts		: Gyrometer sample interrupt to indicate new data ready.
 - vdd-supply		: Analog power supply needed to power device.
 - vlogic-supply	: Digital IO power supply needed for IO and I2C.
 - invn,gpio-int	: GPIO used for interrupt.
 - invn,gpio-en		: GPIO used for power enabling.
 - invn,poll-interval	: Initial data polling interval in milliseconds.

Example:
	i2c@f9925000 {
		mpu3050@68 {
			#address-cells = <1>;
			#size-cells = <0>;
			status = "okay";
			reg = <0x68>;
			compatible = "invn,mpu3050";
			interrupt-parent = <&msmgpio>;
			interrupts = <84 0x2>;
			vlogic-supply = <&pm8110_l14>;
			vdd-supply = <&pm8110_l19>;
			invn,gpio-int = <&msmgpio 84 0x2>;
			invn,gpio-en = <&pm8110_gpios 2 0x2>;
			invn,poll-interval = <200>;
		};
	};