a9scu: QOM cleanups Rename A9SCUState::busdev field to parent_obj and turn realizefn into an instance_init function to allow early MMIO mapping. Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Andreas Färber <andreas.faerber@web.de>