net/hinic: Disable the CSUM offload capability of TUNNEL in SDI mode

driver inclusion
category: bugfix
bugzilla: 4472

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OVS does not support the csum offload capability of tunnel packet. If the
protocol stack does the csum offloading of tunnel packet, it will cause
the packet'csum error; therefore, the csum offload capability of tunnel
packet needs to be disabled in SDI mode.

Signed-off-by: Chiqijun <chiqijun@huawei.com>
Reviewed-by: Luoshaokai <luoshaokai@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>