!4649 arm64/mpam: update reminder message about MBHDL option

Merge Pull Request from: @ci-robot 
 
PR sync from: Zeng Heng <zengheng4@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/ZNROAULGC7L73CEBOL4IAXOS5MTM65UC/ 
 
https://gitee.com/openeuler/kernel/issues/I91YTV 
 
Link:https://gitee.com/openeuler/kernel/pulls/4649

 

Reviewed-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>