arm64: dts: st: add RNG node on stm32mp251

Update the device-tree stm32mp251.dtsi by adding the Random Number
Generator(RNG) node.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

Author: GseoC

arch/arm64/boot/dts/st/stm32mp251.dtsi

@@ -493,6 +493,16 @@
 				status = "disabled";
 			};
 
+			rng: rng@42020000 {
+				compatible = "st,stm32mp25-rng";
+				reg = <0x42020000 0x400>;
+				clocks = <&clk_rcbsec>, <&rcc CK_BUS_RNG>;
+				clock-names = "core", "bus";
+				resets = <&rcc RNG_R>;
+				access-controllers = <&rifsc 92>;
+				status = "disabled";
+			};
+
 			spi8: spi@46020000 {
 				#address-cells = <1>;
 				#size-cells = <0>;