Update Telecom usage of renamed API constants.

Also, ensuring the handover success/failure callbacks are called (found
this while cleaning up API constants).

Test: Make Manual
Change-Id: I7b8fdaf66862c119a372439e95ea6201c6c570a3
Fixes: 73751004
Fixes: 73750515
Fixes: 73750817
Fixes: 74250501