[CORD-2729][CORD-2730] Add S1-MME and SPGW flat networks for P4 use-case in M-CORD Profile

Change-Id: I939ebd4202801155a2858961d81ae88fb6137e85
diff --git a/mcord-cavium.yml b/mcord-cavium.yml
index 89d8741..7e80e33 100644
--- a/mcord-cavium.yml
+++ b/mcord-cavium.yml
@@ -133,6 +133,12 @@
     permit_all_slices: True
     template: private_template
     owner: vhss
+  - name: flat_network_s1mme_p4
+    subnet: 122.0.0.0/24
+    permit_all_slices: True
+    template: flat_template
+    owner: vmme
+
 
 profile_library: "mcord"