Vulkan: Update VMA directory. Bug: chromium:1074162 Change-Id: I6aa545e20f64dda0a1716cf8d0df9ad62fc1a890 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2190624 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>