ARM: dts: stm32: select otg mode for usbotg_hs on stm32746g_eval

Configure USB OTG HS in OTG (DRD) mode on STM32746G_eval.
The USB connector used will determine the role of USB OTG controller.
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32746g-eval.dts

@@ -120,7 +120,7 @@ &usart1 {
 };
 
 &usbotg_hs {
-	dr_mode = "host";
+	dr_mode = "otg";
 	phys = <&usbotg_hs_phy>;
 	phy-names = "usb2-phy";
 	pinctrl-0 = <&usbotg_hs_pins_a>;