ARM: dts: stm32: add support for USB2514B onboard hub on stm32mp157c-ev1

Add support for USB2514B onboard hub on stm32mp157c EV1 board. The HUB
is supplied by a 3v3 PMIC regulator.

Signed-off-by: Fabrice Gasnier <[e-mail]>
Signed-off-by: Alexandre Torgue <[e-mail]>

arch/arm/boot/dts/stm32mp157c-ev1.dts

···
 &usbh_ehci {
 	phys = <&usbphyc_port0>;
 	status = "okay";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	/* onboard HUB */
+	hub@1 {
+		compatible = "usb424,2514";
+		reg = <1>;
+		vdd-supply = <&v3v3>;
+	};
 };
 
 &usbotg_hs {