config: set default value of haltpoll

hulk inclusion
category: config
bugzilla: https://bugzilla.openeuler.org/show_bug.cgi?id=34


CVE: NA

We enable haltpoll by default for the improvement of performance.
X86 has been supported. Now, we will provide it on ARM.

Signed-off-by: Xiangyou Xie <xiexiangyou@huawei.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Reviewed-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Jiajun Chen <chenjiajun8@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>