mpc8544_guts: Fix MemoryRegion name

6544 -> 8544

Signed-off-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
mpc8544_guts: QOM'ify

Introduce type constant, cast macro and rename parent field.

Signed-off-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
mpc8544_guts: Turn qdev initfn into instance_init

SysBus can deal with NULL SysBusDeviceClass::init since 4ce5dae.

Signed-off-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>