vkbench: Change the copyright

BUG=None
TEST=Compile locally

Change-Id: I5943365a9f6217e6c8503714122f7dae6427a0d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vkbench/+/5463373
Auto-Submit: Po-Hsien Wang <pwang@chromium.org>
Reviewed-by: Lina Versace <linyaa@google.com>
Tested-by: Po-Hsien Wang <pwang@chromium.org>
Reviewed-by: Ilja Friedel <ihf@chromium.org>
Commit-Queue: Ilja Friedel <ihf@chromium.org>
11 files changed