net/mlx5e: Move devlink port register and unregister calls

We will re-use the native NIC port net device instance for the Uplink
representor. As such we also don't want to unregister/register the
devlink port as part of the profile.

Signed-off-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>