ARM: dts: axp22x.dtsi: Add usb_power_supply node

Add a node describing the (optional) usbpower-supply of the
axp221 / axp223 pmic.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/axp22x.dtsi

@@ -142,4 +142,9 @@
 			regulator-name = "rtc_ldo";
 		};
 	};
+
+	usb_power_supply: usb_power_supply {
+		compatible = "x-powers,axp221-usb-power-supply";
+		status = "disabled";
+	};
 };