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>
diff --git a/presubmit.sh b/presubmit.sh
index 1cfc59c..5e8a32a 100755
--- a/presubmit.sh
+++ b/presubmit.sh
@@ -4,5 +4,6 @@
 # found in the LICENSE file.
 find \
 	'(' -name '*.[ch]' -or -name '*.cc' ')' \
+	-not -name 'virtgpu_drm.h' \
 	-not -name 'gbm.h' -not -name 'virgl_hw.h' \
 	-exec clang-format -style=file -i {} +