ARM: dts: stm32: add USBPHYC support to stm32mp157c

Add support for USBPHYC (USB PHY Controller) to STM32MP157C SoC.
It manages two 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.dtsi

@@ -739,6 +739,26 @@ ltdc: display-controller@5a001000 {
 			status = "disabled";
 		};
 
+		usbphyc: usbphyc@5a006000 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			compatible = "st,stm32mp1-usbphyc";
+			reg = <0x5a006000 0x1000>;
+			clocks = <&rcc USBPHY_K>;
+			resets = <&rcc USBPHY_R>;
+			status = "disabled";
+
+			usbphyc_port0: usb-phy@0 {
+				#phy-cells = <0>;
+				reg = <0>;
+			};
+
+			usbphyc_port1: usb-phy@1 {
+				#phy-cells = <1>;
+				reg = <1>;
+			};
+		};
+
 		usart1: serial@5c000000 {
 			compatible = "st,stm32h7-uart";
 			reg = <0x5c000000 0x400>;