WIP: grate driver for tegra2 and tegra3 devices

Prerequisite: https://github.com/grate-driver/libdrm (libdrm with grate support)

It's not yet ready for merge, needs more work.

If possible leave here as a placeholder. Actually many Tegra devices are able to run on mainline kernel with decent hardware support and one of biggest blockers for having seamless experience is missing 3D support (required by Wayland environment, like Phosh).