watchdog/corelockup: Add interface to control the detection sensitivity.

ascend inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4F3V1


CVE: NA

--------------------------------

A user-mode interface is added to control the core lockup
detection sensitivity.

Signed-off-by: Xu Qiang <xuqiang36@huawei.com>
Reviewed-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>