minigbm: i915: remove KMS query

minigbm: i915: remove KMS query

This simplifies the code.  We just have to make sure:

- the scanout flag goes to X-tiled.

BUG=b:145747132
TEST=compile and run on Nami

Cq-Depend: chromium:1998011
Change-Id: Ic2a1c367017c28abc3a9307bea53c577bc33e31e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/1976275
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Commit-Queue: Gurchetan Singh <gurchetansingh@chromium.org>
Auto-Submit: Gurchetan Singh <gurchetansingh@chromium.org>