nfp: update Agilio SmartNIC flower firmware to rev AOTC-2.14.A.6

nfp: update Agilio SmartNIC flower firmware to rev AOTC-2.14.A.6

New in this release:
  - Support for ipv6 tunneling
  - Handling of QinQ matching/actions

Improvements:
  - Fix for performance regression under overload conditions
  - Better handling of tunnel flow-merge cases
  - Fix performance regression when tso is enabled with ipv6 traffic

Signed-off-by: Louis Peens <louis.peens@netronome.com>
Tested-by: Charles Murcott <charles.murcott@netronome.com>
Reviewed-by: Heinrich Kuhn <heinrich.kuhn@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>