ARM: dts: cygnus: enable iproc-hwrng

Enable the HW rng driver "iproc-rng200" for all cygnus platforms.
Signed-off-by: Mohamed Ismail Abdul Packir Mohamed <mohamed-ismail.abdul@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Scott Branden <scott.branden@broadcom.com>
Tested-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm-cygnus.dtsi

@@ -421,6 +421,11 @@ spi2: spi@1802a000 {
 			status = "disabled";
 		};
 
+		rng: rng@18032000 {
+			compatible = "brcm,iproc-rng200";
+			reg = <0x18032000 0x28>;
+		};
+
 		sdhci0: sdhci@18041000 {
 			compatible = "brcm,sdhci-iproc-cygnus";
 			reg = <0x18041000 0x100>;