Update the device discovery protos to include the core POD name.

Change-Id: I0d562487f5ea5ba5e5ccfbb89d276a254edc612c
diff --git a/protos/inter_container.proto b/protos/inter_container.proto
index 931ddb9..ac2af4f 100644
--- a/protos/inter_container.proto
+++ b/protos/inter_container.proto
@@ -86,6 +86,7 @@
     string id = 1;
     string parent_id = 2;
     string device_type = 3;
+    string publisher = 4;
 }
 
 message InterAdapterMessageType {