boards: st: nucleo_c071rb: enables HSIUSB48 clock for USB

Enables the HSIUSB48 clock (node clk_hsi48 in the SoC DTSI)
on the nucleo_c071rb platform.

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

Author: jurenat

boards/st/nucleo_c071rb/nucleo_c071rb.dts

@@ -78,6 +78,11 @@
 	status = "okay";
 };
 
+&clk_hsi48 {
+	status = "okay";
+	crs-usb-sof;
+};
+
 &rcc {
 	clocks = <&clk_hse>;
 	clock-frequency = <DT_FREQ_M(48)>;