The mdev attribute "name" is required by some middle software, e.g.
KubeVirt, an open source SW that manages VM on Kubernetes cluster uses
the mdev sysfs directory/file structure to discover mediated device in
nodes in the cluster.

v2:

- Fix the missing defination in gvt_type_attrs. (Zhenyu)

Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Hui Chun Ong <hui.chun.ong@intel.com>
Cc: Terrence Xu <terrence.xu@intel.com>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Signed-off-by: Zhi Wang <zhi.wang.linux@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20220222150532.9090-1-zhi.a.wang@intel.comReviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>