Add disconnect messages related to WFC.

Show error message when user tries to make e-call but emergency calls are
not available over WFC.
Also support showing where WFC is not available in an area.

Bug: 128993720
Test: Unit tests added to confirm remapping.
Change-Id: I82a6be7426e2a7db70130b95bdc929b193047d75
Merged-In: Ia3c0ec00cd2d03b360e4cf4aacfbd6d38c91e071
2 files changed