virtio-mem: factor out fake-offlining into virtio_mem_fake_offline()

... which now matches virtio_mem_fake_online(). We'll reuse this
functionality soon.

Reviewed-by: Wei Yang <[email protected]>
Reviewed-by: Pankaj Gupta <[email protected]>
Cc: "Michael S. Tsirkin" <[email protected]>
Cc: Jason Wang <[email protected]>
Cc: Pankaj Gupta <[email protected]>
Signed-off-by: David Hildenbrand <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Michael S. Tsirkin <[email protected]>

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