Introduce virt/ directory to collect virtchnl files.
We are going to implement a few sizable extensions soon, each of them
increasing virt/ size, so it looks sensible to introduce a new dir.
Suggested-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
