minigbm: Support bo_create_with_modifiers in the dumb driver

Allow only the linear format modifier.

BUG=b:199938788
TEST=Boot reven Macbook 7,1 with modifiers-enabled kernel. See that UI
     comes up.

Change-Id: Icc13fa93677fc364e7de79c1e54a743defc6bc96
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/3289376
Tested-by: Matt Turner <msturner@google.com>
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
Reviewed-by: Chad Versace <chadversary@chromium.org>
Reviewed-by: Matt Turner <msturner@google.com>
Commit-Queue: Matt Turner <msturner@google.com>
Auto-Submit: Matt Turner <msturner@google.com>
1 file changed