mlxsw: spectrum: Set basic trap groups from an array

Instead of calling the same code four times, do it in a loop over array
which contains trap grups to be set.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>