ARM: dts: colibri-imx6: remove pinctrl-names orphan

This is not necessary without a pinctrl-0 statement. Remove this
orphan.
Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-colibri.dtsi

@@ -363,7 +363,6 @@ &uart3 {
 };
 
 &usbotg {
-	pinctrl-names = "default";
 	disable-over-current;
 	dr_mode = "peripheral";
 	status = "disabled";