livepatch/x86: Support livepatch without ftrace

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


CVE: NA

--------------------------------

support livepatch without ftrace for x86_64

supported now:
        livepatch relocation when init_patch after load_module;
        instruction patched when enable;
	activeness function check;
	enforcing the patch stacking principle;

x86_64 use variable length instruction, so there's no need to consider
extra implementation for long jumps.

Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>
Signed-off-by: Li Bin <huawei.libin@huawei.com>
Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
Signed-off-by: Ye Weihua <yeweihua4@huawei.com>
Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>