Introduce APIs for Emergency Number Database version

1) Test API to override file partition for testing
2) System API to notify Telephony Emergency Number database installation
 complete
3) Remove broadcast mechanism

Test: gts
Bug: 136027884

Change-Id: Ie2b0c390948c82ccbb94187a6ded9affd162f5ab
Merged-In: Ie2b0c390948c82ccbb94187a6ded9affd162f5ab
(cherry picked from commit 1b28fdd6)