Use Telephony network country tracker

1) calling is more dependent with telephony network rather than
 geolocation.
2) emergency dialer is using telephony's network country ISO
3) to prevent some bug like 125169407

Also no need to merge emergency number with prefix from sources
under 1.4-HAL.

Bug: 125169407
Bug: 125548678
Test: Manual
Change-Id: I63794ae0c9226e444b86b0468f886c04ca871630