Undo commit "Expose constants in Telephony.Carriers"

Undid carrier constants as @SystemApis.  Also had to move
constants out of annotation.java because any references in
that specific file need to be to public APIs.

Bug: 148170690
Test: make, flash
Change-Id: Ie4b827563dbc373c58ec805bc5400e0950b5b81e
4 files changed