drm/virtgpu: add header

It's useless to try to keep up with a evolving UAPI, so just add it
here temporarily.

Change-Id: I18671f64cdf28af829fef1124f9f93cb4ffddcb4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/2003266
Reviewed-by: David Stevens <stevensd@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Commit-Queue: Gurchetan Singh <gurchetansingh@chromium.org>
3 files changed