livepatch/powerpc: Change livepatch_create_btamp to a public function

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5CJ7X



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A trampoline needs to be created before adding a breakpoint for PPC64.
Change livepatch_create_btamp to a public function and delete redundant
input parameter "struct module *me".

Fix an issue where the branch stub of livepatch is not created if
address of the modified function is a branch function.

Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Reviewed-by: Xu Kuohai <xukuohai@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>