ARM: dts: imx6ul-kontron-n6x1x-s: Add vbus-supply and overcurrent polarity to usb nodes

To silence the warnings shown by the driver at boot time, we add a
fixed regulator for the 5V supply of usbotg2 and specify the polarity
of the overcurrent signal for usbotg1.
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6ul-kontron-n6x1x-s.dtsi

@@ -45,6 +45,13 @@ reg_3v3: regulator-3v3 {
 		regulator-max-microvolt = <3300000>;
 	};
 
+	reg_5v: regulator-5v {
+		compatible = "regulator-fixed";
+		regulator-name = "5v";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+	};
+
 	reg_usb_otg1_vbus: regulator-usb-otg1-vbus {
 		compatible = "regulator-fixed";
 		regulator-name = "usb_otg1_vbus";
@@ -187,6 +194,7 @@ &usbotg1 {
 	srp-disable;
 	hnp-disable;
 	adp-disable;
+	over-current-active-low;
 	vbus-supply = <&reg_usb_otg1_vbus>;
 	status = "okay";
 };
@@ -194,6 +202,7 @@ &usbotg1 {
 &usbotg2 {
 	dr_mode = "host";
 	disable-over-current;
+	vbus-supply = <&reg_5v>;
 	status = "okay";
 };