Annapurna Labs North Bridge Service Registers

Properties:
- compatible : Should contain "annapurna-labs,al-nb-service".
- reg : Offset and length of the register set for the device
- interrupts : The sys fabric interrupts indices
- dev_ord_relax : enable device-order relaxation. This option
				will allow relaxing order constraints between
				reads and writes to different addresses.
				(int, enabled if !=0)

Example:

nb_service {
	compatible = "annapurna-labs,al-nb-service";
	reg = <0xfb070000 0x10000>;
	interrupts = <0 64 4  0 65 4  0 66 4  0 67 4>;
	dev_ord_relax = <1>;
};
