CHROMIUM: Disable RHWO optimization on gen12

TEST= Meet calls on REdrix
BUG=b:246324780

Change-Id: Iea4a07d8ac515fa7a9c69760158ef55e2f3b0f69
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/mesa/+/3946230
Tested-by: Ilja Friedel <ihf@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Reviewed-by: Ilja Friedel <ihf@chromium.org>
Commit-Queue: Prahlad Kilambi <prahladk@google.com>
2 files changed