Disable geolocation time zone detection

Time zone detection code was not referring to the "enable feature"
boolean for the upcoming geolocation time zone detection feature in some
necessary places, leading the time zone detector to conclude the feature
was enabled.

That meant devices would ignore telephony time zone suggestions, but
because geolocation isn't implemented fully yet, there were no
geo-based suggestions. This meant the device would just sit on its
existing time zone.

This change puts in the necessary checks.

Bug: 167904672
Test: build / boot / manually verify telephony info is being used
Change-Id: I7be2dbaa2afd1806b2ba248c3be3f9d5251650e1