igb: improve MAC filter handling

igb: improve MAC filter handling

Using the work which was done for ixgbe driver by Jacob Keller
commit f28437f0481e ("ixgbe: improve mac filter handling") and Alexander
Duyck commit ba8f8c9bd0b2 ("ixgbe: Use __dev_uc_sync and __dev_uc_unsync
for unicast addresses") and out-of-tree igb driver add functionality to
manage (add and delete) MAC filters.

Signed-off-by: Yury Kylulin <yury.kylulin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>