Link port representors to parent PCI device to benefit from
systemd defined naming scheme.

Example from ip tool:
 - without linking:
  eth0 ...
 - with linking:
  eth0 ...
  altname enp24s0f0npf0vf0

The port representor name is being shown in altname, because the name is
longer than IFNAMSIZ (16) limit. Altname can be used in ip tool.
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Tested-by: Sandeep Penigalapati <sandeep.penigalapati@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>