In order to eliminate the QEMUMachine indirection,
add its fields directly to MachineClass.
Do not yet remove qemu_machine field because it is
still in use by sPAPR.
Signed-off-by: NMarcel Apfelbaum <marcel.a@redhat.com>
[AF: Copied fields for sPAPR, too]
Signed-off-by: NAndreas Färber <afaerber@suse.de>