Integrate Emergency functions in Telephony

Patch set 1-6:
1) implement isCurrentEmergencyNumber
2) implement getCurrentEmergencyNumberList
3) backward-compatibility for devices launched before Q
4) deprecate PhoneNumberUtils.isEmergencyNumber
5) add mnc into EmergencyNumber

Bug: 112657134
Test: Treehugger
Change-Id: Ib23ce8332495d0af5abfe6284c8322fac08e2168
1 file changed