arm64: Reserve memory for quick kexec

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

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Reserve memory for quick kexec on arm64
with cmdline "quickkexec=".

Signed-off-by: Sang Yan <sangyan@huawei.com>
Reviewed-by: Chen Wandun <chenwandun@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>