dts: arm: st: c0: Add clk-hsi48 for stm32c071 SOC

Allow to use internal HSI to clock the USB bus if HSE is not available.

Signed-off-by: Tomáš Juřena <jurenatomas@gmail.com>

Author: jurenat

dts/arm/st/c0/stm32c071.dtsi

@@ -7,6 +7,15 @@
 #include <st/c0/stm32c031.dtsi>
 
 / {
+	clocks {
+		clk_hsi48: clk-hsi48 {
+			#clock-cells = <0>;
+			compatible = "st,stm32-hsi48-clock";
+			clock-frequency = <DT_FREQ_M(48)>;
+			status = "disabled";
+		};
+	};
+
 	soc {
 		compatible = "st,stm32c071", "st,stm32c0", "simple-bus";