[VOL-3203] Add port capability (ofp port) to the port message

This consist of adding the ofp port data to the port proto
definition.  This attribute will be used to store the port
capability and will also be populated by an adapter when it
sends a port create message to the Core.

Change-Id: Ia0961eec7edc7e45a2826e135ba1d9d5b70a113a
diff --git a/protos/voltha_protos/device.proto b/protos/voltha_protos/device.proto
index f4c44f5..1341dac 100644
--- a/protos/voltha_protos/device.proto
+++ b/protos/voltha_protos/device.proto
@@ -210,6 +210,10 @@
     fixed64 tx_bytes = 13;
     fixed64 tx_errors = 14;
 
+    // ofp_port represents the characteristics of a port, e.g. hardware
+    // address and supported features.  This field is relevant only for
+    // UNI and NNI ports.   For PON ports, it can be left empty.
+    openflow_13.ofp_port ofp_port = 15;
 }
 
 message Ports {