vm-virtio: Define AccessPlatform trait

Moving the whole codebase to rely on the AccessPlatform definition from
vm-virtio so that we can fully remove it from virtio-queue crate.

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

net_util/src/queue_pair.rs

@@ -10,8 +10,9 @@ use std::num::Wrapping;
 use std::os::unix::io::{AsRawFd, RawFd};
 use std::sync::atomic::{AtomicU64, Ordering};
 use std::sync::Arc;
-use virtio_queue::{AccessPlatform, Queue};
+use virtio_queue::Queue;
 use vm_memory::{Bytes, GuestAddress, GuestMemory, GuestMemoryAtomic};
+use vm_virtio::AccessPlatform;
 
 #[derive(Clone)]
 pub struct TxVirtio {