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
Fixes: 73751004
Fixes: 73750515
Fixes: 73750817
Fixes: 74250501
Merged-In: I8f4af2d465b3acd1aaad61ce8514689237f4e9d5
Change-Id: I8f4af2d465b3acd1aaad61ce8514689237f4e9d5
(cherry picked from commit 315d312f)