A bug in Vulkan-ValidationLayers is stopping changes from being rolled
into ANGLE. Suppress this warning for now, until the root cause is
addressed.

Bug: angleproject:5191
Change-Id: I7c6cb65055bdc7b2eb3679f26f09530b1cff3775
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2495543Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>