Make lmkd enforcing.

Start enforcing SELinux rules for lmkd. Security policy
violations will return an error instead of being allowed.

Change-Id: I2bad2c2094d93ebbcb8ccc4b7f3369419004a3f0
diff --git a/lmkd.te b/lmkd.te
index c6d6a55..2d09ce5 100644
--- a/lmkd.te
+++ b/lmkd.te
@@ -1,6 +1,5 @@
 # lmkd low memory killer daemon
 type lmkd, domain;
-permissive_or_unconfined(lmkd)
 type lmkd_exec, exec_type, file_type;
 
 init_daemon_domain(lmkd)