[qca-nss-ecm] Fix l2tpv2 acceleration in 4.4 kernel

 Ecm should use dev->priv_flags to determine interface type

Change-Id: I1834fa54e8995576dd4907156f1a7aa3381951e9
Signed-off-by: ratheesh kannoth <rkannoth@codeaurora.org>
3 files changed