hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I3ZURN
CVE: NA

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Kernel build would fail in case of CONFIG_HALTPOLL_CPUIDLE=m, caused by
haltpoll_switch_governor() not marked as an exported symbol. Fix this
by complementing the EXPORT_SYMBOL statement.

Fixes: 97c22788 ("cpuidle: fix container_of err in cpuidle_device and cpuidle_driver")
Signed-off-by: NGONG, Ruiqi <gongruiqi1@huawei.com>
Cc: Jiajun Chen <chenjiajun8@huawei.com>
Reviewed-by: NXie XiuQi <xiexiuqi@huawei.com>
Reviewed-by: NKeqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: NCheng Jian <cj.chengjian@huawei.com>