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>

devices/src/ioapic.rs

@@ -344,6 +344,7 @@ impl Ioapic {
             high_addr: 0x0,
             low_addr,
             data,
+            devid: 0,
         };
 
         self.interrupt_source_group