drm/virtgpu: update header am: 78f95c3300 am: d33b7b9da2 am: 8afdb5f45f

Original change: https://android-review.googlesource.com/c/platform/external/libdrm/+/1849794

Change-Id: I8e6e0977418e9d709a539ff1a46d03cd909e05e0