ARM: dts: vf: Fix PCA95xx GPIO expander properties on ZII CFU1

The PCA95xx GPIO expander requires GPIO controller properties to operate
properly.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/vf610-zii-cfu1.dts

@@ -225,6 +225,7 @@ io-expander@22 {
 		compatible = "nxp,pca9554";
 		reg = <0x22>;
 		gpio-controller;
+		#gpio-cells = <2>;
 	};
 
 	lm75@48 {