net/mlx5e: Generalize vport type in vport representor

Beside the special vports (PF/uplink/ecpf), the rest of the vports
are similar.
Remove vf_ prefix from function and variable names.

This patch does not change any functionality.

Signed-off-by: Vu Pham <vuhuong@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Bodong Wang <bodong@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>