!1790 [sync] PR-1650: mm: disable kernelcore=mirror when no mirror memory

Merge Pull Request from: @openeuler-sync-bot 
 

Origin pull request: 
https://gitee.com/openeuler/kernel/pulls/1650 
 
PR sync from: Wupeng Ma <mawupeng1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/Q626MLFO7JFVGNUVF6P3WFB2J7I2UMFY/ 
 
https://gitee.com/openeuler/kernel/issues/I7QV2C 
 
Link:https://gitee.com/openeuler/kernel/pulls/1790

 

Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>