NVIDIA Tegra AHB

Required properties:
- compatible : "nvidia,tegra20-ahb" or "nvidia,tegra30-ahb"
- reg : Should contain 1 register ranges(address and length)

Example:
	ahb: ahb@6000c004 {
		compatible = "nvidia,tegra20-ahb";
		reg = <0x6000c004 0x10c>; /* AHB Arbitration + Gizmo Controller */
	};
