Add API for reporting IMS registration failures

Add ImsRegistrationListener API to report registration failures in
the following scenarios:
1. Idle mode failures - new IMS registration.
2. Ims registration handover failures - Handover of IMS registration
   from one radio technology to another.

Bug: 33430556
Test: m
Change-Id: Ie3bafec41c0198a66aa3ebca660a2a060e511c39
1 file changed