Revert "vmm: Move MemoryManager from I/O ports to MMIO region"

This reverts commit 03108fb88b.

vmm/src/device_manager.rs

@@ -523,15 +523,16 @@ impl DeviceManager {
         #[cfg(feature = "acpi")]
         let memory_manager_clone = memory_manager.clone();
 
-        let memory_manager_device_base = memory_manager.lock().unwrap().device_base();
+        address_manager
+            .allocator
+            .lock()
+            .unwrap()
+            .allocate_io_addresses(Some(GuestAddress(0x0a00)), 0x18, None)
+            .ok_or(DeviceManagerError::AllocateIOPort)?;
 
         address_manager
-            .mmio_bus
-            .insert(
-                memory_manager,
-                memory_manager_device_base.0,
-                MemoryManager::DEVICE_SIZE,
-            )
+            .io_bus
+            .insert(memory_manager, 0xa00, 0x18)
             .map_err(DeviceManagerError::BusError)?;
 
         Ok(DeviceManager {