hw/pci: Add pci_bus_add_fw_cfg_extra_pci_roots() helper pci_bus_add_fw_cfg_extra_pci_roots() calls the fw_cfg API with PCI bus specific arguments. Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20241206181352.6836-5-philmd@linaro.org>