hinic: fix a bug in set rx mode

in set_rx_mode, __dev_mc_sync and netdev_for_each_mc_addr will
repeatedly set the multicast mac address. so we delete this loop.

Signed-off-by: Xue Chaojing <xuechaojing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>