[ONOS-7596] Support reading table entries with counter data in P4Runtime

Change-Id: I85bacb1697a6c881dd69ba74a2162c73ec0b8aee
diff --git a/core/store/serializers/src/main/java/org/onosproject/store/serializers/KryoNamespaces.java b/core/store/serializers/src/main/java/org/onosproject/store/serializers/KryoNamespaces.java
index 0e684fe..0fd964e 100644
--- a/core/store/serializers/src/main/java/org/onosproject/store/serializers/KryoNamespaces.java
+++ b/core/store/serializers/src/main/java/org/onosproject/store/serializers/KryoNamespaces.java
@@ -231,6 +231,7 @@
 import org.onosproject.net.pi.runtime.PiActionGroupMemberId;
 import org.onosproject.net.pi.runtime.PiActionParam;
 import org.onosproject.net.pi.runtime.PiControlMetadata;
+import org.onosproject.net.pi.runtime.PiCounterCell;
 import org.onosproject.net.pi.runtime.PiCounterCellData;
 import org.onosproject.net.pi.runtime.PiCounterCellId;
 import org.onosproject.net.pi.runtime.PiEntity;
@@ -692,6 +693,7 @@
                     PiActionGroupMemberId.class,
                     PiActionParam.class,
                     PiControlMetadata.class,
+                    PiCounterCell.class,
                     PiCounterCellData.class,
                     PiCounterCellId.class,
                     PiEntity.class,