[PATCH v2] drm/i915/gvt: Add mdev device attribute group

[Tian, Kevin]

> From: Zhenyu Wang
> Sent: Thursday, March 16, 2017 6:07 PM
> 
> This adds initial attribute group for mdev to hold vGPU related for each mdev
> device, currently just vGPU id is shown.
> 
> v2: rename group name as "intel_vgpu"
> 
> Signed-off-by: Zhenyu Wang <zhenyuw at linux.intel.com>

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