base-files: set root password if present inside board.json
base-files: add timezone to UCI during config_generate
dropbear: add a uci-defaults script for loading authorized keys
wifi-scripts: populate default wifi credentials and country code from board.json
uboot-envtools: add a board.d script to load defaults from the environment
uboot-envtools: add fw_loadenv tool
base-files: execute uboot-env script before calling config_generate
base-files: uci-defaults: allow setting the number of MACs a radio can use