This is the minimum Vulkan limit.

Bug: angleproject:5212
Change-Id: I627a1446434c7abc2f53525cb71cb40a4927461c
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2491937Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>