Merge branch 'nfp-flower-add-support-for-QinQ-matching'

Simon Horman says:

====================
nfp: flower: add support for QinQ matching

Louis says:

Add new feature to the Netronome flower driver to enable QinQ offload.
This needed a bit of gymnastics in order to not break compatibility with
older firmware as the flow key sent to the firmware had to be updated
in order to make space for the extra field.
====================

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