mlxsw: spectrum_fid: Remove '_ub_' indication from structures and defines

Some structures and defines were added with '_ub_' indication, as there
were equivalent objects for the legacy model.

Now when the legacy model is not used anymore, remove the '_ub_'
indication.

Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>