net: hns: NAPI_POLL_WEIGHT for hns driver

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

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When the HNS driver loaded, always have an error print:
"netif_napi_add() called with weight 256"

This is because the kernel checks the NAPI polling weights
requested by drivers and it prints an error message if a driver
requests a weight bigger than 64.

So use NAPI_POLL_WEIGHT to fix it.

Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>
Reviewed-by: lipeng <lipeng321@huawei.com>
Reviewed-by: Zhitao Yu <yuzhitao@huawei.com>
Reviewed-by: Weiwei Deng <dengweiwei@huawei.com>
Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>