bonding: use ether_addr_equal_64bits to instead of ether_addr_equal

The net_device.dev_addr have more than 2 bytes of additional data after
the mac addr, so it is safe to use the ether_addr_equal_64bits().

Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>