Move GeoTZ toggle to Date&Time settings screen.

Previous sub-menu is deleted.

Toggle is always enabled and shows current configuration
setting. If MLS or auto time zone detection is off,
the toggle has not effect.

Bug: 152746236
Test: toggled and checked dumpsys time_zone_detector
Test: checked summary info on different MLS/set time zone automatically
states combinations
Test: m -j30 RunSettingsRoboTests
ROBOTEST_FILTER="com.android.settings.datetime.LocationTimeZoneDetectionPreferenceControllerTest"

Change-Id: I75ee41cfcaaf34b1b63e18809be4cd614446017d
Merged-In: I75ee41cfcaaf34b1b63e18809be4cd614446017d