boards: arm: nucleo_u385rg_q: enable RNG instance

This commit enables the Random Nb Generator peripheral
instance (RNG) on the target board  nucleo u385rg_q
from STMicroelectronics.

Signed-off-by: Khaoula Bidani <khaoula.bidani-ext@st.com>

Author: kbidani

boards/st/nucleo_u385rg_q/nucleo_u385rg_q.dts

@@ -105,3 +105,7 @@
 	pinctrl-0 = <&dac1_out1_pa4>;
 	pinctrl-names = "default";
 };
+
+&rng {
+	status = "okay";
+};