minigbm: i915: make Y-tiling default

Y-tiling should be the default case, unless the user
explicitly asks for:

(1) a linear buffer
(2) frequent SW access
(3) a scanout buffer

BUG=None
TEST=None
CQ-DEPEND=CL:392547

Change-Id: I6b7751f28c7127a458cc754bc2114ea1dad7a80c
Reviewed-on: https://chromium-review.googlesource.com/398425
Commit-Ready: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
1 file changed