net/mlx5: check extended metadata for meta modification

net/mlx5: check extended metadata for meta modification

The MODIFY_FIELD action requires the extended metadata support
in order to manipulate on METADATA register as well as on MARK register.
Check if it is supported and reject the MODIFY_FIELD action if it is not
just like it was done before for the MARK register modifications.

Fixes: 0588d64ffde3 ("net/mlx5: check extended metadata for mark modification")
Cc: stable@dpdk.org
Signed-off-by: Alexander Kozyrev <akozyrev@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>