i40e: Fix the typo in adding 40GE KR4 mode

This patch fixes the typo in I40E_CAP_PHY_TYPE mode link code.
It was fixed by changing 40000baseLR4_Full to 40000baseKR4_Full

Signed-off-by: Grzegorz Siwik <grzegorz.siwik@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>