Hide API

Hide API that is only used by telephony registry.

Test: Telephony sanity tests
Bug: 149850449
Merged-In: Ie4c46de336097fb7231291f15048329aea0b639c
Change-Id: Ie4c46de336097fb7231291f15048329aea0b639c
(cherry picked from commit f0df0ba2ba735b6c484d3e752c20650d3c222bf1)
2 files changed