Revert "vsock/virtio: fix packet delivery to tap device"

This reverts commit db388b8e which is
commit b32a09ea upstream.

It breaks the build due to previous reverts of ABI breaking changes in
the virtio_transport.c driver.  This is safe to revert here as this
driver is not used in GKI kernels, only in test builds.

Bug: 161946584
Change-Id: Iad31e3a4d4a7b88469cbfa2aa2635bcf61295bd4
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>