[android] how to check "unknown source" by default in settings/security ?

file: <aosp>/device/nvidia/macallan/overlay/frameworks/base/packages/SettingsProvider/res/values/defaults.xml

<bool name="def_bluetooth_on">false</bool>
<bool name="def_wifi_display_on">false</bool>
<bool name="def_install_non_market_apps">true</bool>
<bool name="def_package_verifier_enable">true</bool>