Revert "API changes to Telephony per API review"

The original change was submitted into lmp-preview-dev and should
not have been auto-merged to master.

This reverts commit 80327f7a31b19213ec48e1ab66e6bdc8e76cb0fe.

Change-Id: I9ff8a868ffa3135583c52ef97b15311107716899
5 files changed