net/bonding: fix LACP negotiation

net/bonding: fix LACP negotiation

When two host is connected directly without any devices like switch,
rx_machine_update would receiving partner LACP negotiation packets,
and partner's port mac is filled with zeros in this packet, which is
different with internal's mode4 mac. So in this situation, it would
never go rx_machine branch and then execute mac swap for negotiation!
Thus bond mode 4 will negotiation failed.

Fixes: 56cbc0817399 ("net/bonding: fix LACP negotiation")
Cc: stable@dpdk.org
Signed-off-by: Yicai Lu <luyicai@huawei.com>
Reviewed-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>