ARM: dts: stm32mp1: Add EHCI support for stm32mp157c-ev1 board

Add DT nodes to enable EHCI support

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/arch/arm/dts/stm32mp157c-ev1.dts b/arch/arm/dts/stm32mp157c-ev1.dts
index e2128af..902a42b 100644
--- a/arch/arm/dts/stm32mp157c-ev1.dts
+++ b/arch/arm/dts/stm32mp157c-ev1.dts
@@ -96,6 +96,13 @@
 	};
 };
 
+&usbh_ehci {
+	phys = <&usbphyc_port0>;
+	phy-names = "usb";
+	vbus-supply = <&vbus_sw>;
+	status = "okay";
+};
+
 &usbotg_hs {
 	pinctrl-names = "default";
 	pinctrl-0 = <&usbotg_hs_pins_a>;