Revert "x86/insn: Make insn_complete() static"

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8MGE6


CVE: NA

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This reverts commit f935178b.
insn_complete() is still used by function of livepatch without ftrace.

Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>