Revert "ozone: Enable vulkan by default"

This reverts commit f3c9ed0efe2ade7757607bcf356712883c315450.

Reason for revert: breaks Linux Chromium OS ASan LSan Tests

Bug: 887048

Original change's description:
> ozone: Enable vulkan by default
> 
> Vulkan is enabled by default on Linux desktop (X11) builds. Enable it on
> ozone as well to make sure we have build coverage.
> 
> Bug: 861853
> Test: compile
> Change-Id: I7c15e365b2a4cfc7160847457ce9bf46a3f12f1e
> Reviewed-on: https://chromium-review.googlesource.com/1229233
> Commit-Queue: Michael Spang <spang@chromium.org>
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Reviewed-by: Chris Blume <cblume@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#592451}

TBR=spang@chromium.org,piman@chromium.org,cblume@chromium.org

Change-Id: I6a95fdfdb742e4a876382c72b212bacd2b601c23
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 861853
Reviewed-on: https://chromium-review.googlesource.com/1235194
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592579}
2 files changed