net/mlx5: relax list utility atomic operations
net/mlx5: relax list utility atomic operations

The atomic operation in the list utility no need a barriers because the
critical part are managed by RW lock.

Relax them.

Signed-off-by: Matan Azrad <6969f5f553ad7652679a585a85d7321babc90464@nvidia.com>
Acked-by: Suanming Mou <ffae22abfb44f67da81795938a64e892585787cc@nvidia.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk