ixgbe: add support for nfc addition and removal of filters

This change is meant to allow for nfc to insert and remove filters in order
to test the ethtool interface which includes it's own rules manager.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>