ARM: dts: stm32: Enable USB FS on stm32f746-disco

This patch enables USB FS on stm32f746-disco (Host mode) with 5V VBUS
enable.
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32f746-disco.dts

@@ -67,6 +67,14 @@ usbotg_hs_phy: usb-phy {
 		clocks = <&rcc 0 STM32F7_AHB1_CLOCK(OTGHSULPI)>;
 		clock-names = "main_clk";
 	};
+
+	/* This turns on vbus for otg fs for host mode (dwc2) */
+	vcc5v_otg_fs: vcc5v-otg-fs-regulator {
+		compatible = "regulator-fixed";
+		gpio = <&gpiod 5 0>;
+		regulator-name = "vcc5_host1";
+		regulator-always-on;
+	};
 };
 
 &clk_hse {
@@ -79,6 +87,13 @@ &usart1 {
 	status = "okay";
 };
 
+&usbotg_fs {
+	dr_mode = "host";
+	pinctrl-0 = <&usbotg_fs_pins_a>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
 &usbotg_hs {
 	dr_mode = "host";
 	phys = <&usbotg_hs_phy>;