Instead of accessing iomem via struct virito_pci_device directly,
tweak to call the io accessors through the iomem structure. This will
ease the splitting of modern virtio device logic.
Signed-off-by: NJason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210104065503.199631-2-jasowang@redhat.comSigned-off-by: NMichael S. Tsirkin <mst@redhat.com>