virtio_net: replace netdev_alloc_skb_ip_align() with napi_alloc_skb()
This gives small but noticeable rx performance improvement (2-3%) and will allow exploiting future napi improvement. Signed-off-by: NPaolo Abeni <pabeni@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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