vm-virtio: Add IOMMU support to virtio-pmem

Adding virtio feature VIRTIO_F_IOMMU_PLATFORM when explicitly asked by
the user. The need for this feature is to be able to attach the virtio
device to a virtual IOMMU.

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

vmm/src/device_manager.rs

@@ -789,7 +789,7 @@ impl DeviceManager {
                 *mem_slots += 1;
 
                 let virtio_pmem_device =
-                    vm_virtio::Pmem::new(file, pmem_guest_addr, size as GuestUsize)
+                    vm_virtio::Pmem::new(file, pmem_guest_addr, size as GuestUsize, false)
                         .map_err(DeviceManagerError::CreateVirtioPmem)?;
 
                 devices.push(Box::new(virtio_pmem_device) as Box<dyn vm_virtio::VirtioDevice>);