PXA3xx GCU Controller
---------------------
Required properties:
- compatible : "marvell,pxa300-gcu"
- reg : should contain the register range (address and length).
- interrupts : Controller interrupt.
- clocks: phandle to the PXA specific input clock.
Example for PXA300:
display-controller@54000000 {
compatible = "marvell,pxa300-gcu";
reg = <0x54000000 0x1000>;
interrupts = <39>;
clocks = <&clks CLK_PXA300_GCU>;
};