Allows kvmvapic to compile if sysbus.h is removed from apic_internal.h,
from which it is indirectly included.
sysbus.h will be removed from apic_internal.h after converting
APICs to ICCDevice.
Signed-off-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Andreas Färber <afaerber@suse.de>