Adds necessary permissions to system apis

adds privileged permission for getCaptivePortalServerUrl
adds tether privileged permission for
startTethering,isTetheringSupported

bug:62348162

Test: make and manual testing
Change-Id: I8eb8e3c9dcd7201abe9ea303ee57fe99073d67eb
3 files changed
tree: fab82a4a59f45fca3617e1f32999c272b43c0e73
  1. core/
  2. services/
  3. tests/