Add resource config for the GeoTz feature

Add resource config for the Geolocation tz detection feature.

The feature can still be enabled for local dev via a persistent system
property, but the config is intended to be the "proper" way to turn the
feature on.

Bug: 172546738
Test: build / boot
Change-Id: Ia35dde9308274825d0d3c4afe908b6310aa834e4