pc: add rombar to compat properties for pc-0.10 and pc-0.11 So '-M pc-0.10' and '-M pc-0.11' will use the fw_cfg rom load method by default. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>