sepolicy: restrict access to uid_cpupower files

Do not let apps read /proc/uid_cpupower/time_in_state,
/proc/uid_cpupower/concurrent_active_time,
/proc/uid_cpupower/concurrent_policy_time.

b/71718257

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

Change-Id: I812694adfbb4630f7b56aa7096dc2e6dfb148b15
diff --git a/private/genfs_contexts b/private/genfs_contexts
index 2acaf9f..8f0d489 100644
--- a/private/genfs_contexts
+++ b/private/genfs_contexts
@@ -78,6 +78,7 @@
 genfscon proc /uid_time_in_state u:object_r:proc_uid_time_in_state:s0
 genfscon proc /uid_concurrent_active_time u:object_r:proc_uid_concurrent_active_time:s0
 genfscon proc /uid_concurrent_policy_time u:object_r:proc_uid_concurrent_policy_time:s0
+genfscon proc /uid_cpupower/ u:object_r:proc_uid_cpupower:s0
 genfscon proc /uptime u:object_r:proc_uptime:s0
 genfscon proc /version u:object_r:proc_version:s0
 genfscon proc /vmallocinfo u:object_r:proc_vmallocinfo:s0