dts: arm: stm32u3: add entropy node as Random Number Generator

Add the true Random Number Generator (RNG) node for stm32u3 socs.

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

Author: kbidani

dts/arm/st/u3/stm32u3.dtsi

@@ -14,6 +14,7 @@
 
 / {
 	chosen {
+		zephyr,entropy = &rng;
 		zephyr,flash-controller = &flash;
 	};
 
@@ -273,6 +274,14 @@
 			#io-channel-cells = <1>;
 			status = "disabled";
 		};
+
+		rng: rng@420c0800 {
+			compatible = "st,stm32-rng";
+			reg = <0x420c0800 0x400>;
+			clocks = <&rcc STM32_CLOCK(AHB2, 18)>;
+			interrupts = <94 0>;
+			status = "disabled";
+		};
 	};
 };