ARM: dt: tegra20.dtsi: Add Memory Controller(MC) nodes

Add Tegra MC(Memory Controller) nodes for tegra20.dtsi.
Signed-off-by: Hiroshi DOYU <hdoyu@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

arch/arm/boot/dts/tegra20.dtsi

@@ -211,5 +211,12 @@ ahb: ahb@6000c004 {
 		compatible = "nvidia,tegra20-ahb";
 		reg = <0x6000c004 0x10c>; /* AHB Arbitration + Gizmo Controller */
 	};
+
+	mc {
+		compatible = "nvidia,tegra20-mc";
+		reg = <0x7000f000 0x024
+		       0x7000f03c 0x3c4>;
+		interrupts = <0 77 0x04>;
+	};
 };