cm: sepolicy: fix performance settings

Change-Id: Idea17856b4aef9258688a3ad58d0e5cac6d805a6
diff --git a/sepolicy/system_app.te b/sepolicy/system_app.te
new file mode 100644
index 0000000..6ebd1ea
--- /dev/null
+++ b/sepolicy/system_app.te
@@ -0,0 +1,2 @@
+# For performance settings
+allow system_app sysfs_devices_system_cpu:file rw_file_perms;