Restrict access to uid_concurrent_*_time

Do not let apps read uid_concurrent_active_time and
uid_concurrent_policy_time.

b/68399339

Test: Check that they can't be read from the shell
    without root permissions and system_server was able
    to read them

Change-Id: I6f09ef608607cb9f4084ba403a1e7254b8c49a06
diff --git a/private/system_server.te b/private/system_server.te
index 2102391..7b0aad1 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -694,6 +694,8 @@
   proc_stat
   proc_uid_cputime_showstat
   proc_uid_time_in_state
+  proc_uid_concurrent_active_time
+  proc_uid_concurrent_policy_time
   proc_version
   proc_vmallocinfo
 }:file r_file_perms;