arm64: tegra: Add external memory controller node for Tegra210

Add external memory controller (EMC) node for Tegra210
Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra210.dtsi

@@ -895,6 +895,17 @@ mc: memory-controller@70019000 {
 		#iommu-cells = <1>;
 	};
 
+	external-memory-controller@7001b000 {
+		compatible = "nvidia,tegra210-emc";
+		reg = <0x0 0x7001b000 0x0 0x1000>,
+		      <0x0 0x7001e000 0x0 0x1000>,
+		      <0x0 0x7001f000 0x0 0x1000>;
+		clocks = <&tegra_car TEGRA210_CLK_EMC>;
+		clock-names = "emc";
+		interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+		nvidia,memory-controller = <&mc>;
+	};
+
 	sata@70020000 {
 		compatible = "nvidia,tegra210-ahci";
 		reg = <0x0 0x70027000 0x0 0x2000>, /* AHCI */