net: sched: adapt Qdisc kabi

hulk inclusion
category: bugfix
CVE: CVE-2021-39713

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To adapt to KABI, put rcu before gso_skb for 64-bit kernel. RCU will use
16 Bytes, and the space is enough. It's unuse for 32-bit kernel.

Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Reviewed-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Reviewed-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>