livepatch: Introduce 'struct arch_klp_data'

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4UAQ1



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Introduce 'struct arch_klp_data' to encapsulate arch related data.

Preparatory for moving 'struct klp_func_node' out of 'arch' and
reducing duplicated codes.

Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>
Reviewed-by: Kuohai Xu <xukuohai@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>