minigbm: dri: Set the plane sizes on bo creation.

minigbm: dri: Set the plane sizes on bo creation.

I cut a corner here on a previous patch and apparently it is used.

Since DRI does not give us useful horizontal & vertical strides
(especially considering things like auxiliary surfaces), do this
calculation based on offsets & buffer strides.

BUG=1061315
TEST=test_that graphics_Gbm on Zork.

Change-Id: Idbca7ce42f4f8a692129a2f8ab5d9c3ccd796496
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/2100795
Tested-by: Bas Nieuwenhuizen <basni@chromium.org>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Commit-Queue: Ilja H. Friedel <ihf@chromium.org>