[scripts][do-qemux86] add a few more virtio devices and tweaks
[scripts][do-qemux86] add a few more virtio devices and tweaks

littlekernel/lk,hollanderic/lkstuff,hollanderic/lkstuff,littlekernel/lk,hollanderic/lkstuff,littlekernel/lk,hollanderic/lkstuff,littlekernel/lk