Add support of macvlan CNI for bess-upf

Change-Id: Id5426855060d0d94d06656ce9df1c51e2a4b50ae
diff --git a/omec/omec-user-plane/values.yaml b/omec/omec-user-plane/values.yaml
index c248a4a..aad2459 100644
--- a/omec/omec-user-plane/values.yaml
+++ b/omec/omec-user-plane/values.yaml
@@ -70,11 +70,13 @@
       ip: 192.168.252.3/24
       #mac:
       #vlan:
+      #iface:
     core:
       gateway: 192.168.250.1
       ip: 192.168.250.3/24
       #mac:
       #vlan:
+      #iface:
     cfgFiles:
       upf.json:
         mode: dpdk