virtio-devices: introduce ActivationContext for device activation

Signed-off-by: Peter Oskolkov <posk@google.com>

virtio-devices/src/console.rs

@@ -710,12 +710,13 @@ impl VirtioDevice for Console {
         self.read_config_from_slice(self.config.lock().unwrap().as_slice(), offset, data);
     }
 
-    fn activate(
-        &mut self,
-        mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        interrupt_cb: Arc<dyn VirtioInterrupt>,
-        mut queues: Vec<(usize, Queue, EventFd)>,
-    ) -> ActivateResult {
+    fn activate(&mut self, context: crate::device::ActivationContext) -> ActivateResult {
+        let crate::device::ActivationContext {
+            mem,
+            interrupt_cb,
+            mut queues,
+            ..
+        } = context;
         self.common.activate(&queues, interrupt_cb.clone())?;
         self.resizer
             .acked_features