ARM: dt: tegra20.dtsi: Add GART node

Add a node for the Tegra20 GART
Signed-off-by: Hiroshi DOYU <hdoyu@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

arch/arm/boot/dts/tegra20.dtsi

@@ -218,5 +218,11 @@ mc {
 		       0x7000f03c 0x3c4>;
 		interrupts = <0 77 0x04>;
 	};
+
+	gart {
+		compatible = "nvidia,tegra20-gart";
+		reg = <0x7000f024 0x00000018	/* controller registers */
+		       0x58000000 0x02000000>;	/* GART aperture */
+	};
 };