ARM: dts: stm32: Add USB OTG support to DH PDK2

The DH PDK2 board is capable of USB OTG on the X14 USB Mini-AB connector,
fill in the missing bits to make USB OTG possible instead of peripheral.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
Cc: linux-stm32@st-md-mailman.stormreply.com
To: linux-arm-kernel@lists.infradead.org
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32mp15xx-dhcom-pdk2.dtsi

@@ -281,9 +281,12 @@ &usbh_ehci {
 };
 
 &usbotg_hs {
-	dr_mode = "peripheral";
-	phys = <&usbphyc_port1 0>;
+	dr_mode = "otg";
+	pinctrl-0 = <&usbotg_hs_pins_a>;
+	pinctrl-names = "default";
 	phy-names = "usb2-phy";
+	phys = <&usbphyc_port1 0>;
+	vbus-supply = <&vbus_otg>;
 	status = "okay";
 };