arm64: tegra: Rename agic -> interrupt-controller

Device tree nodes for interrupt controllers should be named "interrupt-
controller", so rename the AGIC accordingly.
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra210-p2371-2180.dts

@@ -122,7 +122,7 @@ dma@702e2000 {
 			status = "okay";
 		};
 
-		agic@702f9000 {
+		interrupt-controller@702f9000 {
 			status = "okay";
 		};
 	};

arch/arm64/boot/dts/nvidia/tegra210-smaug.dts

@@ -1721,7 +1721,7 @@ dma@702e2000 {
 			status = "okay";
 		};
 
-		agic@702f9000 {
+		interrupt-controller@702f9000 {
 			status = "okay";
 		};
 	};

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

@@ -1355,7 +1355,7 @@ adma: dma@702e2000 {
 			status = "disabled";
 		};
 
-		agic: agic@702f9000 {
+		agic: interrupt-controller@702f9000 {
 			compatible = "nvidia,tegra210-agic";
 			#interrupt-cells = <3>;
 			interrupt-controller;