[ONOS-4711] Move YANG data types to data types to remove dependency

Change-Id: I2297fc1fa69c7609765fc970d5614447db8e9f88
diff --git a/utils/yangutils/datamodel/src/main/java/org/onosproject/yangutils/datamodel/YangUnion.java b/utils/yangutils/datamodel/src/main/java/org/onosproject/yangutils/datamodel/YangUnion.java
index d4c0306..f20d5cc 100644
--- a/utils/yangutils/datamodel/src/main/java/org/onosproject/yangutils/datamodel/YangUnion.java
+++ b/utils/yangutils/datamodel/src/main/java/org/onosproject/yangutils/datamodel/YangUnion.java
@@ -22,6 +22,7 @@
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
 import org.onosproject.yangutils.datamodel.utils.Parsable;
 import org.onosproject.yangutils.datamodel.utils.YangConstructType;
+import org.onosproject.yangutils.datamodel.utils.builtindatatype.YangDataTypes;
 
 /*
  * Reference RFC 6020.