net/mlx5e: Use nic mode netdev ndos and ethtool ops for uplink representor

Remove dedicated uplink rep netdev ndos and ethtools ops.
We will re-use the native NIC port net device instance and ethtool ops for
the Uplink representor.

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