Revert "Remove prefix for emergency number address while dialing per carrier requirement"

This reverts commit 8e6de2f1.

Reason for revert: Caused regression in emergency calling.
Bug: 186377507
Bug: 182126268

Change-Id: Ic6c1d786239f7118a2f9f1ec74d0343e4ae3a58c
Merged-In: If616530c01f7c3e50734988a1dc5b9d69dd4c2c0