If there are packets in hardware when changing the speed or duplex,
it may cause hardware hang up.

This patch adds the code to wait rx fbd clean up when ae stopped.
Signed-off-by: NYonglong Liu <liuyonglong@huawei.com>
Signed-off-by: NPeng Li <lipeng321@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>