net/mlx5: Rename devlink port ops struct for PFs/VFs

As this struct is only used for devlink ports created for PF/VF,
add it to the name of the variable to distinguish from the SF related
ops struct.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Shay Drory <shayd@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>