mlxsw: reg: Add Switch FID Flooding Profiles Register

The SFFP register populates the fid flooding profile tables used for the
NVE flooding and Compressed-FID Flooding (CFF).

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://lore.kernel.org/r/ca42eb67763bd0c7cf035afc62ef73632f3f61a6.1700503643.git.petrm@nvidia.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>