Vulkan: Enable ASTC tests on Nvidia ANGLE emulates ASTC, so we are able to run these tests fine. Bug: angleproject:6441 Change-Id: I641a729db5c00d203c857710b17754161251d785 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5539020 Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com> Auto-Submit: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>