Revert 8c3988dff9 and de54c58838
These purported to add VirtIO V1 support, but did so by merely negotiating
the VIRTIO_F_VERSION_1 feature on legacy VirtIO. This is no by any means
sufficient, and can only assume the TinyEMU mentioned is not anything
near spec compliant. Revert as it just gets in the way of actual V1
support.