virtio: Start converting VirtioDevice to QOM realize
Temporarily allow either VirtioDeviceClass::init or VirtioDeviceClass::realize. Introduce VirtioDeviceClass::unrealize for symmetry. Signed-off-by: NAndreas Färber <afaerber@suse.de> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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