hw/versatile_pci: Expose multiple sysbus mmio regions Clean up versatile_pci to expose the various PCI mmio regions properly as separate mmio regions rather than as a single mmio which uses callbacks to map and unmap everything. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Avi Kivity <avi@redhat.com>