Initial commit; kernel source import

Documentation/devicetree/bindings/iommu/nvidia,tegra20-gart.txt

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+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 */
+	};