Restrict access to suspend control

Test: m selinux_policy
Change-Id: Ieccfd2aa059da065ace4f2db1b9634c52dd2cb24
diff --git a/private/system_app.te b/private/system_app.te
index 27e8ef1..38e7938 100644
--- a/private/system_app.te
+++ b/private/system_app.te
@@ -80,6 +80,7 @@
   -iorapd_service
   -ipmemorystore_service
   -netd_service
+  -system_suspend_control_service
   -virtual_touchpad_service
   -vold_service
   -vr_hwc_service