Merge branch 'nfp-vlan-strip-and-insert'

Simon Horman says:

====================
nfp: support VLAN strip and insert

this series adds support to the NFP driver for HW offload of both:

* RX VLAN ctag/stag strip
* TX VLAN ctag insert
====================

Signed-off-by: David S. Miller <davem@davemloft.net>