ARM: dts: aspeed: Add #interrupt-cells property to gpio controllers

Allows the GPIO controller to be used as an interrupt parent.

of_irq_find_parent() skips interrupt controller nodes that do
not have the #interrupt-cells property.
Signed-off-by: NMark Walton <mark.walton@serialtek.com>
Signed-off-by: NJoel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-g4.dtsi

@@ -197,6 +197,7 @@
 				gpio-ranges = <&pinctrl 0 0 220>;
 				clocks = <&syscon ASPEED_CLK_APB>;
 				interrupt-controller;
+				#interrupt-cells = <2>;
 			};
 
 			timer: timer@1e782000 {

arch/arm/boot/dts/aspeed-g5.dtsi

@@ -250,6 +250,7 @@
 				gpio-ranges = <&pinctrl 0 0 220>;
 				clocks = <&syscon ASPEED_CLK_APB>;
 				interrupt-controller;
+				#interrupt-cells = <2>;
 			};
 
 			timer: timer@1e782000 {