!4857 x86/srso: Add SRSO mitigation for Hygon processors

Merge Pull Request from: @ci-robot 
 
PR sync from: Wei Li <liwei391@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/ABUSBVAXJSZQNOU6RX3ZQC2JHFBC47BN/ 
 
https://gitee.com/src-openeuler/kernel/issues/I94P0E 
 
Link:https://gitee.com/openeuler/kernel/pulls/4857

 

Reviewed-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>