Add logs for AIDL death recipient registration

If we do not receive a notification that the AIDL service died,
currently we cannot tell if it is due to an error in the registration or
the notification. Add logs to help detect an issue if it occurs.

Test: atest RILTest
Bug: 245674767
Change-Id: I14b41555f19f5ab37dbbe2a83f7c303c5b080aad