Added the high usage hidden APIs back

Added the high usage hidden APIs back for Q or older
apps. Apps built on R SDK should use the new API
getNetworkCountryIso(int).

Test: Build
Bug: 150368215
Merged-In: I1ccfbe269f3d9b91b715c20bd2f200cfb20e2a8c
Change-Id: I1ccfbe269f3d9b91b715c20bd2f200cfb20e2a8c
(cherry picked from commit ff8275e6)