ARM: dts: stm32: enable USBPHYC on stm32mp157c-ev1

This patch enables USBPHYC (USB PHY Controller) on stm32mp157c-ev1.
This enables the two usbphyc usb2 ports.
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

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

@@ -71,3 +71,7 @@ timer@11 {
 		status = "okay";
 	};
 };
+
+&usbphyc {
+	status = "okay";
+};