Merge branch 'sfc-conntrack-offload'

Edward Cree says:

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sfc: support conntrack NAT offload

The EF100 MAE supports performing NAT (and NPT) on packets which match in
 the conntrack table.  This series adds that capability to the driver.
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Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>