Explicitly enable rngd to keep status quo

It may not be needed but that is untested.

Author: fhunleth

nerves_defconfig

@@ -42,6 +42,7 @@ BR2_PACKAGE_F2FS_TOOLS=y
 BR2_PACKAGE_LINUX_FIRMWARE=y
 BR2_PACKAGE_LINUX_FIRMWARE_RALINK_RT2XX=y
 BR2_PACKAGE_LINUX_FIRMWARE_RTL_87XX=y
+BR2_PACKAGE_RNG_TOOLS=y
 # BR2_PACKAGE_RNG_TOOLS_JITTERENTROPY_LIBRARY is not set
 BR2_PACKAGE_CA_CERTIFICATES=y
 BR2_PACKAGE_LIBP11=y
@@ -71,3 +72,4 @@ BR2_TARGET_UBOOT_CUSTOM_MAKEOPTS="DEVICE_TREE=stm32mp157c-dk2"
 BR2_NERVES_SYSTEM_NAME="nerves_system_osd32mp1"
 BR2_PACKAGE_NBTTY=y
 BR2_PACKAGE_NERVES_CONFIG=y
+BR2_PACKAGE_NERVES_CONFIG_ACCEPT_RNG_NOTICE=y