!2946 LoongArch: disable 40bit user space by default

Merge Pull Request from: @ci-robot 
 
PR sync from: Hongchen Zhang <zhanghongchen@loongson.cn>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/DJLYDB3LLEK7C2GA45V6N4VX5ILXSY3K/ 
 
https://gitee.com/openeuler/kernel/issues/I8IRUM 
 
Link:https://gitee.com/openeuler/kernel/pulls/2946

 

Reviewed-by: Juxin Gao <gaojuxin@loongson.cn>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>