vmm: Add ioapic to KvmInterruptManager

By having a reference to the IOAPIC, the KvmInterruptManager is going
to be able to initialize properly the legacy interrupt source group.

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

vmm/src/device_manager.rs

@@ -458,6 +458,7 @@ impl DeviceManager {
             address_manager.allocator.clone(),
             vm_info.vm_fd.clone(),
             kvm_gsi_msi_routes,
+            ioapic.clone(),
         ));
 
         let console = DeviceManager::add_console_device(