Annapurna Labs Cache Coherency Unit

Properties:
- compatible : Should contain "annapurna-labs,al-ccu".
- reg : Offset and length of the register set for the device.
- io_coherency : enable io-coherency (int, enabled if !=0)

Example:

ccu {
	compatible = "annapurna-labs,al-ccu";
	reg = <0x0 0xfb090000 0x0 0x10000>;
	io_coherency = <1>;
};
