disable stealing by default

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8PIYZ


CVE: NA

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

Steal tasks to improve CPU utilization can solve some performance
problems such as mysql, but not all scenarios are optimized, such as
hackbench.

So turn off by default.

Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>
Signed-off-by: Cheng Yu <serein.chengyu@huawei.com>