ARM: dts: Add PRNG module for exynos4

Add Pseudo Random Number Generator (PRNG) node of Security Sub System
(SSS) to Exynos 4 DTSI.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

arch/arm/boot/dts/exynos4.dtsi

@@ -954,4 +954,12 @@ sysmmu_fimd0: sysmmu@11E20000 {
 		power-domains = <&pd_lcd0>;
 		#iommu-cells = <0>;
 	};
+
+	prng: rng@10830400 {
+		compatible = "samsung,exynos4-rng";
+		reg = <0x10830400 0x200>;
+		clocks = <&clock CLK_SSS>;
+		clock-names = "secss";
+		status = "disabled";
+	};
 };