ARM: dts: qcom: Add RNG device tree node

Add the necessary DT node to probe the rng driver on
msm8974 platforms.
Signed-off-by: NStanimir Varbanov <svarbanov@mm-sol.com>
Acked-by: NStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: NKumar Gala <galak@codeaurora.org>

arch/arm/boot/dts/qcom-msm8974.dtsi

@@ -186,5 +186,12 @@
 			clocks = <&gcc GCC_BLSP1_UART2_APPS_CLK>, <&gcc GCC_BLSP1_AHB_CLK>;
 			clock-names = "core", "iface";
 		};
+
+		rng@f9bff000 {
+			compatible = "qcom,prng";
+			reg = <0xf9bff000 0x200>;
+			clocks = <&gcc GCC_PRNG_AHB_CLK>;
+			clock-names = "core";
+		};
 	};
 };