Android Goldfish PIC

Android Goldfish programmable interrupt device used by Android
emulator.

Required properties:

- compatible : should contain "google,goldfish-pic"
- reg        : <registers mapping>
- interrupts : <interrupt mapping>

Example for mips when used in cascade mode:

        cpuintc {
                #interrupt-cells = <0x1>;
                #address-cells = <0>;
                interrupt-controller;
                compatible = "mti,cpu-interrupt-controller";
        };

        interrupt-controller@1f000000 {
                compatible = "google,goldfish-pic";
                reg = <0x1f000000 0x1000>;

                interrupt-controller;
                #interrupt-cells = <0x1>;

                interrupt-parent = <&cpuintc>;
                interrupts = <0x2>;
        };
