ARM: dts: s5pv210: Add interrupt-controller property to gph3

The GPH3 pins on s5pv210 have interrupt support and had the
interrupt-cells property but was missing the interrupt-controller
property.

Signed-off-by: Jonathan Bakker <xc-racer2@live.ca>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

arch/arm/boot/dts/s5pv210-pinctrl.dtsi

@@ -273,6 +273,8 @@
 	gph3: gph3 {
 		gpio-controller;
 		#gpio-cells = <2>;
+
+		interrupt-controller;
 		#interrupt-cells = <2>;
 	};