qemu: Remove redundant arguments to qemuBuildSerialChrDeviceStr()
qemu: Remove redundant arguments to qemuBuildSerialChrDeviceStr()

Since we're already passing the full virDomainDef, it doesn't
make sense to also pass def->os.arch and def->os.machine as
separate arguments.

eskultety/libvirt,VenkatDatta/libvirt,taget/libvirt,taget/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,libvirt/libvirt,olafhering/libvirt,datto/libvirt,nertpinx/libvirt,zippy2/libvirt,fabianfreyer/libvirt,zippy2/libvirt,taget/libvirt,nertpinx/libvirt,nertpinx/libvirt,zippy2/libvirt,jfehlig/libvirt,crobinso/libvirt,jfehlig/libvirt,taget/libvirt,olafhering/libvirt,VenkatDatta/libvirt,eskultety/libvirt,eskultety/libvirt,taget/libvirt,nertpinx/libvirt,datto/libvirt,libvirt/libvirt,nertpinx/libvirt,eskultety/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,eskultety/libvirt,jardasgit/libvirt,andreabolognani/libvirt,datto/libvirt,jfehlig/libvirt,jfehlig/libvirt,libvirt/libvirt,crobinso/libvirt,jardasgit/libvirt,olafhering/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,crobinso/libvirt,VenkatDatta/libvirt,zippy2/libvirt,crobinso/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,libvirt/libvirt,datto/libvirt,jardasgit/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,datto/libvirt,olafhering/libvirt