igc: Add PHY power management control

igc: Add PHY power management control

BugLink: https://bugs.launchpad.net/bugs/1902578
PHY power management control should provide a reliable and accurate
indication of PHY reset completion and decrease the delay time
after a PHY reset

Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit bcb3244ccdc4cebb6ed3d47d973da7b1a03837c0)
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Acked-by: Andrea Righi <andrea.righi@canonical.com>
Acked-by: William Breathitt Gray <william.breathitt.gray@canonical.com>
Signed-off-by: Ian May <ian.may@canonical.com>