mlx5_common is shared library between mlx5 net, VDPA and regex PMD.
It is better to use common initialization helper instead of using
RTE_PRIORITY_CLASS priority.
Suggested-by: David Marchand <david.marchand@redhat.com> Signed-off-by: Parav Pandit <parav@mellanox.com> Reviewed-by: David Marchand <david.marchand@redhat.com>