net/mlx5: Don't register ops for non-PF/VF/SF port and avoid checks in ops

Currently each PF/VF/SF devlink port op called into mlx5 code calls
is_port_function_supported() to check if the port is either
PF, VF or SF. So make sure that the ops are registered with devlink
port only for those and avoid the is_port_function_supported() checks
in ops.

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