Add TelephonyManager test hidden API for testing

Test: atest
Bug: 172507765

Change-Id: I30a5b695770509dc803ab5623c75e653d40f4d11
Merged-In: I30a5b695770509dc803ab5623c75e653d40f4d11
(cherry picked from commit 53cfc4a8944c491934973d47f8c4503a5644b8ed)
1 file changed