encoding: replace the route origin selflearning with prefixann

refs: #4280

Change-Id: I9db6b92f681650c21e82251f17f03f4ae2834b24
diff --git a/src/encoding/nfd-constants.hpp b/src/encoding/nfd-constants.hpp
index 6cc2c59..0ec923d 100644
--- a/src/encoding/nfd-constants.hpp
+++ b/src/encoding/nfd-constants.hpp
@@ -103,7 +103,7 @@
   ROUTE_ORIGIN_CLIENT        = 65,
   ROUTE_ORIGIN_AUTOCONF      = 66,
   ROUTE_ORIGIN_NLSR          = 128,
-  ROUTE_ORIGIN_SELFLEARNING  = 129,
+  ROUTE_ORIGIN_PREFIXANN     = 129,
   ROUTE_ORIGIN_STATIC        = 255,
 };