minigbm: add option to force 256 byte alignment of linear buffers

BUG=b:172617736
TEST=run glxgears crostini on mushu

Change-Id: I0a5934e3676a70dd0bdb5f53701114fb0c19f016
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/2522635
Reviewed-by: David Riley <[email protected]>
Reviewed-by: Gurchetan Singh <[email protected]>
Tested-by: Dominik Behr <[email protected]>
Auto-Submit: Dominik Behr <[email protected]>
Commit-Queue: Dominik Behr <[email protected]>
1 file changed