!2272 Optimize KASLR free space map generation for ARM32

Merge Pull Request from: @julien-sun 
 
This is OSPP 2023 project PR for https://summer-ospp.ac.cn/org/prodetail/23b970532?lang=en&list=pro

Related issue´╝Ühttps://gitee.com/openeuler/kernel/issues/I83I1B 
 
Link:https://gitee.com/openeuler/kernel/pulls/2272 

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