!772 timekeeping: Make CLOCKSOURCE_VALIDATE_LAST_CYCLE configurable

Merge Pull Request from: @liaoyu15 
 
Currently, only x86 architecture supports the CLOCKSOURCE_VALIDATE_LAST_CYCLE
option. This option ensures that the timestamps returned by the clocksource are
monotonically increasing, and helps avoid issues caused by hardware failures.

This commit makes CLOCKSOURCE_VALIDATE_LAST_CYCLE configurable on
the arm64 architecture, helps increase system stability and reliability. 
 
Link:https://gitee.com/openeuler/kernel/pulls/772

 

Reviewed-by: Jialin Zhang <zhangjialin11@huawei.com>
Reviewed-by: Wei Li <liwei391@huawei.com>
Reviewed-by: Liu Chao <liuchao173@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>