Dialog DA9063 PMIC GPIO extender

Required properties:
- compatible : Should be
    - "dlg,da9063-gpio"

- #gpio-cells : Should be two.
  - first cell is the pin number
  - second cell is used to specify flags. Flags are currently unused.

- gpio-controller : Marks the device node as a GPIO controller.

Example:

gpio_extender: gpio {
	compatible = "dlg,da9063-gpio";
	gpio-controller;
	#gpio-cells = <2>;
	};
