drm-tests: Start using updated minigbm APIs

This change makes the drm-tests use updated minigbm
APIs after https://crrev.com/c/1162170 and
https://crrev.com/c/1170773

Change-Id: Iefb031f2c4f64949b07c83fe2d19d556790490cd
Reviewed-on: https://chromium-review.googlesource.com/1283069
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
4 files changed