Support maximum wait time for Cell broadcast

Geo-Fencing Maximum Wait Time a device shall allow to determines it
location meeting operator policy. If the device is unable to determine
its position meeting operator policy within the GeoFencing Maximum Wait Time,
it shall present the alert to the user and discontinue further positioning
determination for the alert.

Bug: 139022202
Test: manual
Change-Id: If3d8d7915f2d86da20c63e99bee01f30e3ea89c0