Moving PortStatistcs port number to Long to aling with Port class

Change-Id: I43ab8760dc3bf192cd2f47511819076fbf1070b6
diff --git a/core/api/src/main/java/org/onosproject/net/device/PortStatistics.java b/core/api/src/main/java/org/onosproject/net/device/PortStatistics.java
index 25fb057..3b9f19a 100644
--- a/core/api/src/main/java/org/onosproject/net/device/PortStatistics.java
+++ b/core/api/src/main/java/org/onosproject/net/device/PortStatistics.java
@@ -15,6 +15,8 @@
  */
 package org.onosproject.net.device;
 
+import org.onosproject.net.PortNumber;
+
 /**
  * Statistics of a port.
  */
@@ -24,10 +26,19 @@
      * Returns the port number.
      *
      * @return port number
+     * @deprecated ONOS 1.12 Magpie please use portNumber()
      */
+    @Deprecated
     int  port();
 
     /**
+     * Returns the port number.
+     *
+     * @return port number
+     */
+    PortNumber portNumber();
+
+    /**
      * Returns the number of packets received.
      *
      * @return the number of packets received