Temporarily suppress this test as it might be caused by a dEQP bug.

BUG=angleproject:1128

Change-Id: I9c6f1b95edca55f54f3292227ebc81d4ddc57f0a
Reviewed-on: https://chromium-review.googlesource.com/294580Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Corentin Wallez <cwallez@chromium.org>