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>

virtio-devices/src/pmem.rs

@@ -27,13 +27,14 @@ use std::sync::atomic::AtomicBool;
 use std::sync::{Arc, Barrier};
 use versionize::{VersionMap, Versionize, VersionizeResult};
 use versionize_derive::Versionize;
-use virtio_queue::{AccessPlatform, DescriptorChain, Queue};
+use virtio_queue::{DescriptorChain, Queue};
 use vm_memory::{
     Address, ByteValued, Bytes, GuestAddress, GuestMemoryAtomic, GuestMemoryError,
     GuestMemoryLoadGuard,
 };
 use vm_migration::VersionMapped;
 use vm_migration::{Migratable, MigratableError, Pausable, Snapshot, Snapshottable, Transportable};
+use vm_virtio::AccessPlatform;
 use vmm_sys_util::eventfd::EventFd;
 
 const QUEUE_SIZE: u16 = 256;