graphics/igt-gpu-tools: Test suite for drm drivers
The igt testing suite is separated into tests and tools that target kms,
memory management, and command submission. These tests are especially
helpful for low-level reporting, transparent tracking of kernel changes,
and efficient debugging of modern drm drivers.
Reviewed by: diizzy, lwhsu, jrm
Differential Revision: https://reviews.freebsd.org/D36213