arm: dts: rockchip: rk3399: enable rng at the SoC level

The rng is embedded in the SoC so enable it in the device tree
universally, the use of it can be controlled by enabling/disabling
at the device config level.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Cc: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Kever Yang<kever.yang@rock-chips.com>

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

@@ -13,10 +13,6 @@
 	};
 };
 
-&rng {
-	status = "okay";
-};
-
 &i2c0 {
 	u-boot,dm-pre-reloc;
 };

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

@@ -24,10 +24,6 @@
 	u-boot,dm-pre-reloc;
 };
 
-&rng {
-	status = "okay";
-};
-
 &sdhci {
 	max-frequency = <25000000>;
 	u-boot,dm-pre-reloc;

arch/arm/dts/rk3399-rockpro64-u-boot.dtsi

@@ -15,10 +15,6 @@
 	};
 };
 
-&rng {
-	status = "okay";
-};
-
 &spi1 {
 	spi_flash: flash@0 {
 		u-boot,dm-pre-reloc;

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

@@ -32,7 +32,7 @@
 	rng: rng@ff8b8000 {
 		compatible = "rockchip,cryptov1-rng";
 		reg = <0x0 0xff8b8000 0x0 0x1000>;
-		status = "disabled";
+		status = "okay";
 	};
 
 	dmc: dmc {