livepatch/ppc64: Fix preemption check when enabling

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I60N44


CVE: NA

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Misspelling of 'CONFIG_PREEMPTION' may cause old function not being
checked, which results in a running function being livepatched.

Fixes: 20106abf ("livepatch: Check whole stack when CONFIG_PREEMPT is set")
Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>
Reviewed-by: Kuohai Xu <xukuohai@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>