[Intel-gfx] [PATCH v7 22/22] docs: vfio: Add vfio device cdev description

[Tian, Kevin]

> From: Liu, Yi L <yi.l.liu at intel.com>
> Sent: Thursday, March 16, 2023 8:56 PM
> 
> This gives notes for userspace applications on device cdev usage.
> 
> Signed-off-by: Yi Liu <yi.l.liu at intel.com>

Reviewed-by: Kevin Tian <kevin.tian at intel.com>