Fix duplicate registration of openconfig-odtn model

Change-Id: I17eb46890f430679c8fd109a175f8ba2d19785b9
(cherry picked from commit b80f526f1444c2937bcee64d8c559e0b4f10d357)
diff --git a/models/openconfig-odtn/BUILD b/models/openconfig-odtn/BUILD
index 290b9aa..072b8f7 100644
--- a/models/openconfig-odtn/BUILD
+++ b/models/openconfig-odtn/BUILD
@@ -10,7 +10,7 @@
 
 yang_model(
     app_name = "org.onosproject.models.openconfig-odtn",
-    custom_registrator = False,
+    custom_registrator = True,
     required_apps = APPS,
     title = "OpenConfig RD v0.3 YANG Models",
     deps = COMPILE_DEPS,