hulk inclusion
category: bugfix
bugzilla: 13257
CVE: NA

Product team don't want to account irqtime to task.
They want to show the cpu usage to customers as before.

In this patch we add a cmdline option, which is determined by
the product team to turn it on or off.
Signed-off-by: NXie XiuQi <xiexiuqi@huawei.com>
Reviewed-by: NCheng Jian <cj.chengjian@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>