s390x: initialize virtio dev region
When running the s390x virtio machine we can potentially use uninitialized memory for the virtio device backing ram. That can lead to weird breakge. So let's better initialize it to 0 properly. Reported-by: NAndreas Färber <afaerber@suse.de> Signed-off-by: NAlexander Graf <agraf@suse.de> --- v1 -> v2: - use target_phys_addr_t
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