Bug: 62706738
Test: Check that uid_time_in_state can't be read from
the shell without root permissions and that
"dumpsys batterystats --checkin| grep ctf" shows frequency
data (system_server was able to read uid_time_in_state)

Signed-off-by: Andres Oportus <andresoportus@google.com>
Change-Id: Id0780f2464f17d49f06a7bf3158eae7363efb468