Move the Location time zone detection setting

Move the Location time zone detection setting to Date & Time as per
UI review / product request.

This initial commit just moves the existing MVP setting behavior to a
different screen. Still invisible by default.

Enable with:
$ adb shell setprop persist.sys.location_time_zone_detection_feature_enabled 1
.. plus a reboot.

Bug: 152746236
Test: Manual: build / boot / toggle switch in SettingsUI / inspect output of adb shell dumpsys time_zone_detector
Test: m -j30 RunSettingsRoboTests ROBOTEST_FILTER="com.android.settings.datetime.LocationTimeZoneDetectionPreferenceControllerTest"
Test: m -j30 RunSettingsRoboTests ROBOTEST_FILTER="com.android.settings.datetime.locationtimezone.TimeZoneDetectionTogglePreferenceControllerTest"
Test: m -j30 RunSettingsRoboTests ROBOTEST_FILTER="com.android.settings.datetime.locationtimezone.TimeZoneDetectionSettingsTest"
Change-Id: I9ecfa853014a9f92086a9cb2d34e1517474ceb93