net/mlx5e: Add LAG warning for unsupported tx type

If bond tx type is not active-backup or hash, LAG offload can't be
enabled. When CHANGEUPPER event is received, and both PFs (and only
them) under the same lag master are about to be enslaved, a warning
is returned for user to know the offload failure, otherwise PFs are
enslaved silently without LAG offload activated.

Signed-off-by: Jianbo Liu <jianbol@mellanox.com>
Reviewed-by: Raed Salem <raeds@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Raed Salem <raeds@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>