cargo: Update to the latest kvm-ioctls version

We need to rely on the latest kvm-ioctls version to benefit from the
recent addition of unregister_ioevent(), allowing us to detach a
previously registered eventfd to a PIO or MMIO guest address.

Because of this update, we had to modify the current constraint we had
on the vmm-sys-util crate, using ">= 0.1.1" instead of being strictly
tied to "0.2.0".

Once the dependency conflict resolved, this commit took care of fixing
build issues caused by recent modification of kvm-ioctls relying on
EventFd reference instead of RawFd.

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

vfio/src/vfio_pci.rs

@@ -240,7 +240,7 @@ impl InterruptRoute {
         let irq_fd = EventFd::new(libc::EFD_NONBLOCK).map_err(VfioPciError::EventFd)?;
         let gsi = allocator.allocate_gsi().ok_or(VfioPciError::AllocateGsi)?;
 
-        vm.register_irqfd(irq_fd.as_raw_fd(), gsi)
+        vm.register_irqfd(&irq_fd, gsi)
             .map_err(VfioPciError::IrqFd)?;
 
         Ok(InterruptRoute {