Hide APIs exposed for Telephony mainline which is no longer needed in R.

The APIs were added in b/144351078, b/148097978 and b/148116922.
b/151665796 is used to revert them.

Bug: 151665796
Bug: 144351078
Bug: 148097978
Bug: 148116922
Test: build
Change-Id: I08db8c5c0161747a7e775a8de0daa7077b513f10