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Gateworks PLD GPIO controller bindings

The GPIO controller should be a child node on an I2C bus,
see: i2c/i2c.txt for details.

Required properties:
- compatible: Should be "gateworks,pld-gpio"
- reg: I2C slave address
- gpio-controller: Marks the device node as a GPIO controller.
- #gpio-cells: Should be <2>. The first cell is the gpio number and
  the second cell is used to specify optional parameters.

Example:

pld@56 {
	compatible = "gateworks,pld-gpio";
	reg = <0x56>;
	gpio-controller;
	#gpio-cells = <2>;
};