NVIDIA Tegra 20 GART

Required properties:
- compatible: "nvidia,tegra20-gart"
- reg: Two pairs of cells specifying the physical address and size of
  the memory controller registers and the GART aperture respectively.

Example:

	gart {
		compatible = "nvidia,tegra20-gart";
		reg = <0x7000f024 0x00000018	/* controller registers */
		       0x58000000 0x02000000>;	/* GART aperture */
	};
