!1836 tcp: Reduce chance of collisions in inet6_hashfn().

Merge Pull Request from: @ci-robot 
 
PR sync from: Wang Yufen <wangyufen@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/P3JACN4MLJW7G5NKTXBTQ46GZ5R5YEBI/ 
 
https://gitee.com/src-openeuler/kernel/issues/I7FUFX 
 
Link:https://gitee.com/openeuler/kernel/pulls/1836

 

Reviewed-by: Yue Haibing <yuehaibing@huawei.com>
Signed-off-by: Liu YongQiang <liuyongqiang13@huawei.com>