minigbm: Remove Tegra support.

Background:
Tegra K1 (nyan) boards are not longer supported by ChromeOS. The last
compatible device stopped receiving updates after 2020-08-01.

ChromeOS code developed for this board can be removed.

Changes:
* Remove Tegra minigbm handler and plumbing.

Bug: b/180870522
Change-Id: I288b292fa8c85c17e9df1e65b0bf3295b56cb8a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/2782243
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Commit-Queue: Fritz Koenig <frkoenig@chromium.org>
4 files changed