net-next/hinic:add rx checksum offload for HiNIC

In order to improve performance, this patch adds rx checksum offload
for the HiNIC driver. Performance test(Iperf) shows more than 80%
improvement in TCP streams.

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