Make update_engine work with non-AB update devices am: 6651a120b4 am: 9fd5abad11
am: c51665346b

Change-Id: I3376d600b4bc1c7127d0c05b5db95fe926f202a0
diff --git a/update_engine.rc b/update_engine.rc
index 0576045..a7d6235 100644
--- a/update_engine.rc
+++ b/update_engine.rc
@@ -3,3 +3,7 @@
     user root
     group root system wakelock inet cache
     writepid /dev/cpuset/system-background/tasks
+    disabled
+
+on property:ro.boot.slot_suffix=*
+    enable update_engine