vendor: add update_engine to forked list

Change-Id: Ia46f290f002ef2de633d6390c57c3b78b5c22494
diff --git a/utils/aosp-forked-list b/utils/aosp-forked-list
index 39c405c..c01084c 100644
--- a/utils/aosp-forked-list
+++ b/utils/aosp-forked-list
@@ -45,5 +45,6 @@
 system/nfc
 system/netd
 system/sepolicy
+system/update_engine
 system/vold
 system/hardware/interfaces