nfp: flower: add geneve option match offload

Introduce a new layer for matching on geneve options. This allows
offloading filters configured to match geneve with options.

Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>