Move lmkd into it's own domain.

lmkd low memory killer daemon

The kernel low memory killer logic has been moved to a new daemon
called lmkd.  ActivityManager communicates with this daemon over a
named socket.

This is just a placeholder policy, starting off in unconfined_domain.

Change-Id: Ia3f9a18432c2ae37d4f5526850e11432fd633e10
diff --git a/file_contexts b/file_contexts
index 2907183..5c25545 100644
--- a/file_contexts
+++ b/file_contexts
@@ -80,6 +80,7 @@
 /dev/socket/gps		u:object_r:gps_socket:s0
 /dev/socket/installd	u:object_r:installd_socket:s0
 /dev/socket/keystore	u:object_r:keystore_socket:s0
+/dev/socket/lmkd        u:object_r:lmkd_socket:s0
 /dev/socket/mdns	u:object_r:mdns_socket:s0
 /dev/socket/netd	u:object_r:netd_socket:s0
 /dev/socket/property_service	u:object_r:property_socket:s0
@@ -142,6 +143,7 @@
 /system/bin/dnsmasq     u:object_r:dnsmasq_exec:s0
 /system/bin/hostapd     u:object_r:hostapd_exec:s0
 /system/bin/clatd	u:object_r:clatd_exec:s0
+/system/bin/lmkd        u:object_r:lmkd_exec:s0
 #############################
 # Vendor files
 #