ARM: dts: imx6dl: alti6p: fix different USB related warnings

Fix USB-related warnings in imx6dl alti6p device tree by disabling
unused usbphynop1 and usbphynop2 USB PHYs and properly configuring
over-current detection on related ports. This fixes the following
warnings with the current kernel:
usb_phy_generic usbphynop1: dummy supplies not allowed for exclusive requests
usb_phy_generic usbphynop2: dummy supplies not allowed for exclusive requests
imx_usb 2184200.usb: No over-current polarity defined
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6dl-alti6p.dts

@@ -361,6 +361,7 @@ &usbh1 {
 	pinctrl-0 = <&pinctrl_usbh1>;
 	phy_type = "utmi";
 	dr_mode = "host";
+	over-current-active-low;
 	status = "okay";
 };
 
@@ -370,9 +371,18 @@ &usbotg {
 	pinctrl-0 = <&pinctrl_usbotg>;
 	phy_type = "utmi";
 	dr_mode = "host";
+	over-current-active-low;
 	status = "okay";
 };
 
+&usbphynop1 {
+	status = "disabled";
+};
+
+&usbphynop2 {
+	status = "disabled";
+};
+
 &usdhc1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_usdhc1>;