Regard the release when the APIs became deprecated as Cardinal

Change-Id: I072fa33a2a70baa7466d7a0dc5067191476be0f3
diff --git a/utils/misc/src/main/java/org/onlab/packet/IPacket.java b/utils/misc/src/main/java/org/onlab/packet/IPacket.java
index 38684eb..64e6ac3 100644
--- a/utils/misc/src/main/java/org/onlab/packet/IPacket.java
+++ b/utils/misc/src/main/java/org/onlab/packet/IPacket.java
@@ -75,6 +75,7 @@
      * @param length
      *            length of the data to deserialize
      * @return the deserialized data
+     * @deprecated in Cardinal Release
      */
     @Deprecated
     IPacket deserialize(byte[] data, int offset, int length);