net/mlx5: E-switch, Remove redundant comment about meta rules

Meta rules are created/destroyed per vport and not in eswitch
init/destroy.

Signed-off-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>