virtio-devices: Handle virtio queues interrupts from transport layer

Instead of relying on the virtio-queue crate to store the information
about the MSI-X vectors for each queue, we handle this directly from the
PCI transport layer.

This is the first step in getting closer to the upstream version of
virtio-queue so that we can eventually move fully to the upstream
version.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

virtio-devices/src/rng.rs

@@ -76,7 +76,7 @@ impl RngEpollHandler {
 
     fn signal_used_queue(&self) -> result::Result<(), DeviceError> {
         self.interrupt_cb
-            .trigger(&VirtioInterruptType::Queue, Some(&self.queues[0]))
+            .trigger(VirtioInterruptType::Queue(0))
             .map_err(|e| {
                 error!("Failed to signal used queue: {:?}", e);
                 DeviceError::FailedSignalingUsedQueue(e)