hw/acpi: Update GED with vCPU Hotplug VMSD for migration

hw/acpi: Update GED with vCPU Hotplug VMSD for migration

The ACPI CPU hotplug states must be migrated along with other vCPU
hotplug states to the destination VM. Update the GED's VM State
Description (VMSD) table subsection to conditionally include the CPU
Hotplug VM State Description (VMSD).

Excerpt of GED VMSD State Dump at Source:

    "acpi-ged (16)": {
        "ged_state": {
            "sel": "0x00000000"
        },
        [...]
        "acpi-ged/cpuhp": {
            "cpuhp_state": {
                "selector": "0x00000005",
                "command": "0x00",
                "devs": [
                    {
                        "is_inserting": false,
                        "is_removing": false,
                        "ost_event": "0x00000000",
                        "ost_status": "0x00000000"
                    },
		    [...]
                    {
                        "is_inserting": false,
                        "is_removing": false,
                        "ost_event": "0x00000000",
                        "ost_status": "0x00000000"
                    }
                ]
            }
        }
    },

Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Message-Id: <20241103102419.202225-6-salil.mehta@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>