build, misc: Bump vmm-sys-util dependency

The structure of the vmm-sys-util crate has changed with lots of code
moving to submodules.

This change adjusts the use of the imported structs to reference the
submodules.

Fixes: #145

Signed-off-by: Rob Bradford <robert.bradford@intel.com>

vm-virtio/src/transport/pci_common_config.rs

@@ -257,7 +257,7 @@ mod tests {
     use std::sync::atomic::AtomicUsize;
     use std::sync::Arc;
     use vm_memory::GuestMemoryMmap;
-    use vmm_sys_util::EventFd;
+    use vmm_sys_util::eventfd::EventFd;
 
     struct DummyDevice(u32);
     const QUEUE_SIZE: u16 = 256;

vm-virtio/src/transport/pci_device.rs

@@ -26,7 +26,7 @@ use pci::{
 };
 use vm_allocator::SystemAllocator;
 use vm_memory::{Address, ByteValued, GuestAddress, GuestMemoryMmap, GuestUsize, Le32};
-use vmm_sys_util::{EventFd, Result};
+use vmm_sys_util::{errno::Result, eventfd::EventFd};
 
 use super::VirtioPciCommonConfig;
 use crate::{