hw/misc/vmlaunchupdate: add api header Add a separate header file for guest usable api definitions. CC: Alex Graf <graf@amazon.com> CC: Gerd Hoffman <kraxel@redhat.com> Reviewed-by: Alexander Graf <graf@amazon.com> Signed-off-by: Ani Sinha <anisinha@redhat.com> Message-ID: <20260819041105.110625-1-anisinha@redhat.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>