Add test function for emergency number db update

1) get emergency number db version
2) override emergency db file partition

Test: atest TelephonyHostTest#testEmergencyNumberDb
(Though the condition is RVC, I manually triggered all the running with QT build,
 and ensured each Assert is hit)
https://paste.googleplex.com/4679407325151232
Bug: 136027884

Change-Id: Ifaec0af0e5100900453a2d794c85cd91925189a1
Merged-In: Ifaec0af0e5100900453a2d794c85cd91925189a1
(cherry picked from commit 3b6ee776ffffc65aa479199e2441efdfeeb73c1e)
1 file changed