arm: dts: rockchip: rk3399: add and enable rng node

Add rng node in rk3399-u-boot.dtsi and enable it in
rk3399-evb-u-boot.dtsi.

Signed-off-by: Lin Jinhan <troy.lin@rock-chips.com>
Tested-by: Peter Robinson <pbrobinson@gmail.com>
Reviewed-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

arch/arm/dts/rk3399-evb-u-boot.dtsi

@@ -11,3 +11,7 @@
 		u-boot,spl-boot-order = &sdhci, &sdmmc;
 	};
 };
+
+&rng {
+	status = "okay";
+};

arch/arm/dts/rk3399-u-boot.dtsi

@@ -25,6 +25,12 @@
 		clock-names = "pclk_ddr_mon";
 	};
 
+	rng: rng@ff8b8000 {
+		compatible = "rockchip,cryptov1-rng";
+		reg = <0x0 0xff8b8000 0x0 0x1000>;
+		status = "disabled";
+	};
+
 	dmc: dmc {
 		u-boot,dm-pre-reloc;
 		compatible = "rockchip,rk3399-dmc";