net/mlx5e: TC, Add missing policer validation

There is a missing policer validation when offloading police action
with tc action api. Add it.

Fixes: 7d1a5ce4 ("net/mlx5e: TC, Support tc action api for police")
Signed-off-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>