ixgbe: fix PHY link setup for 82599

Fix pointer to setup_link for 82599.

This resolves some link issues when advertising modes unsupported
by the link partner.

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>