pci: Enable GSI routing (MSI type) for AArch64

In this commit we saved the BDF of a PCI device and set it to "devid"
in GSI routing entry, because this field is mandatory for GICv3-ITS.

Signed-off-by: Michael Zhao <michael.zhao@arm.com>

virtio-devices/src/transport/pci_device.rs

@@ -336,6 +336,7 @@ impl VirtioPciDevice {
         msix_num: u16,
         iommu_mapping_cb: Option<Arc<VirtioIommuRemapping>>,
         interrupt_manager: &Arc<dyn InterruptManager<GroupConfig = MsiIrqGroupConfig>>,
+        pci_device_bdf: u32,
     ) -> Result<Self> {
         let device_clone = device.clone();
         let locked_device = device_clone.lock().unwrap();
@@ -364,6 +365,7 @@ impl VirtioPciDevice {
             let msix_config = Arc::new(Mutex::new(MsixConfig::new(
                 msix_num,
                 interrupt_source_group.clone(),
+                pci_device_bdf,
             )));
             let msix_config_clone = msix_config.clone();
             (Some(msix_config), Some(msix_config_clone))