[scripts][do-qemu] minor restructure of how args are passed to qemu
[scripts][do-qemu] minor restructure of how args are passed to qemu

No functional change, just a tiny tweak that had been floating around.

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