i40e: process link events when setting up switch

Add code to handle link events when updating the PF switch. This
allows link information to be properly provided to VFs in all cases.

Change-ID: If314c95f3d39259ef4c40a4a3b823381e28fb24f
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Jim Young <jamesx.m.young@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>