net/mlx5: fix spelling mistake "metdata" -> "metadata"

There is a spelling mistake in a esw_warn warning message. Fix it.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>