ARM: dts: vf610: remove unused gpio-range-cells property

The anyway depricated gpio-range-cells property was never used
by the pin controller driver. This patch removes it.
Signed-off-by: NStefan Agner <stefan@agner.ch>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/vfxxx.dtsi

@@ -224,7 +224,6 @@
 			iomuxc: iomuxc@40048000 {
 				compatible = "fsl,vf610-iomuxc";
 				reg = <0x40048000 0x1000>;
-				#gpio-range-cells = <3>;
 			};
 
 			gpio0: gpio@40049000 {