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>

pci/src/msi.rs

@@ -201,6 +201,7 @@ impl MsiConfig {
                     high_addr: self.cap.msg_addr_hi,
                     low_addr: self.cap.msg_addr_lo,
                     data: self.cap.msg_data as u32,
+                    devid: 0,
                 };
 
                 if let Err(e) = self