VOL-596: Enhanced Security Control ME not derived from EntityClass base

Change-Id: I1a5bbcd78eacb753771a4d93bc440e736428194a
diff --git a/voltha/extensions/omci/omci_entities.py b/voltha/extensions/omci/omci_entities.py
index 11e1c72..8a919f3 100644
--- a/voltha/extensions/omci/omci_entities.py
+++ b/voltha/extensions/omci/omci_entities.py
@@ -762,7 +762,7 @@
     mandatory_operations = {OP.Get, OP.Set}
 
 
-class EnhSecurityControl:
+class EnhSecurityControl(EntityClass):
     class_id = 332
     attributes = [
         ECA(ShortField("managed_entity_id", None), {AA.R}),