dts: nordic: rng_hci disabled by default

As a software construct that depends upon Bluetooth being enabled,
this device should not be enabled by default. Most nRF SoC's have
internal `RNG` hardware that is much more efficient to access.

Signed-off-by: Jordan Yates <jordan@embeint.com>

Author: JordanYates

dts/vendor/nordic/nrf_common.dtsi

@@ -32,7 +32,7 @@
 
 	rng_hci: entropy_bt_hci {
 		compatible = "zephyr,bt-hci-entropy";
-		status = "okay";
+		status = "disabled";
 	};
 
 	sw_pwm: sw-pwm {