main, vmm: add explicit PCI BDF support for Rng device

This was missing in [0] but is required for proper explicit PCI BDF
management, e.g., when a VM is created via libvirt and each device has
an explicit BDF.

[0] https://github.com/cloud-hypervisor/cloud-hypervisor/pull/7965

On-behalf-of: SAP philipp.schuster@sap.com
Signed-off-by: Philipp Schuster <philipp.schuster@cyberus-technology.de>

vmm/src/lib.rs

@@ -2654,7 +2654,7 @@ mod unit_tests {
     use crate::vm_config::DebugConsoleConfig;
     use crate::vm_config::{
         ConsoleConfig, ConsoleOutputMode, CoreScheduling, CpuFeatures, CpusConfig, HotplugMethod,
-        MemoryConfig, PayloadConfig, RngConfig,
+        MemoryConfig, PayloadConfig, PciDeviceCommonConfig, RngConfig,
     };
 
     fn create_dummy_vmm() -> Vmm {
@@ -2716,7 +2716,7 @@ mod unit_tests {
             net: None,
             rng: RngConfig {
                 src: PathBuf::from("/dev/urandom"),
-                iommu: false,
+                pci_common: PciDeviceCommonConfig::default(),
             },
             balloon: None,
             fs: None,