All the CPU hotplug facilities are ready. Assemble them to start up CPU hot-plug capability for arm/virt. This also adds CPU cold plug support to arm virt machine board. CPU cold plug means adding CPU by using "-device xx-arm-cpu" when we bring up Qemu. Signed-off-by: Salil Mehta <salil.mehta@huawei.com> Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com> (cherry picked from commit d5d118431a64c4202cb28c27bdea0f8667beb5dd)
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