arm64: quick_kexec: Move to stand-alone file

hulk inclusion
category: feature
bugzilla: 48159
CVE: N/A

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It's better to make the non-upstreamed feature into stand-alone file,
which make us easy to backport mainline patches.

No functional changes.

Cc: Sang Yan <sangyan@huawei.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Sang Yan <sangyan@huawei.com>
Reviewed-by: Liu Shixin <liushixin2@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>