i40e: Added code to prevent double resets

Clear the VFLR bit after reset processing, instead of before. This
prevents double resets on VF init.

Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>