acpi: cpuhp: implement hot-remove parts of CPU hotplug interface
it adds hw registers needed for handling CPU hot-remove and corresponding AML methods to request and eject a CPU with necessary hotplug callbacks in pc,piix4,ich9 code. Signed-off-by: NIgor Mammedov <imammedo@redhat.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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