Revert "SEBA-357: remove deprecated uplink field"

This reverts commit 97cdd04bd3bbda4e7a4d46a1c3eaa6433e3581c1.

Change-Id: I1b50ca5e4c6de6298b6c1f10adde1006ef4f52b3
diff --git a/tosca-configs/bbsim/bbsim-2.yaml b/tosca-configs/bbsim/bbsim-2.yaml
index 5f08d15..63a3f44 100644
--- a/tosca-configs/bbsim/bbsim-2.yaml
+++ b/tosca-configs/bbsim/bbsim-2.yaml
@@ -45,6 +45,7 @@
         switch_datapath_id: of:0000000000000002
         switch_port: "3"
         outer_tpid: "0x8100"
+        uplink: "65536"
         nas_id: "NAS_ID"
         serial_number: "bbsim.voltha.svc:50060"
       requirements: