ARM: dts: kirkwood: Fix interrupt controller node name

The current ones makes validation unhappy:

  kirkwood-lsxhl.dt.yaml: main-interrupt-ctrl@20200: $nodename:0:
    'main-interrupt-ctrl@20200' does not match
    '^interrupt-controller(@[0-9a-f,]+)*$'
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/boot/dts/kirkwood.dtsi

@@ -228,7 +228,7 @@ l2: l2-cache@20128 {
 			reg = <0x20128 0x4>;
 		};
 
-		intc: main-interrupt-ctrl@20200 {
+		intc: interrupt-controller@20200 {
 			compatible = "marvell,orion-intc";
 			interrupt-controller;
 			#interrupt-cells = <1>;