ARM: dts: ox820: align interrupt controller node name with dtschema

Fixes dtbs_check warnings like:

gic@1000: $nodename:0: 'gic@1000' does not match '^interrupt-controller(@[0-9a-f,]+)*$'

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Acked-by: Neil Armstrong <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/arm/boot/dts/ox820.dtsi

···
 				clocks = <&armclk>;
 			};
 
-			gic: gic@1000 {
+			gic: interrupt-controller@1000 {
 				compatible = "arm,arm11mp-gic";
 				interrupt-controller;
 				#interrupt-cells = <3>;