lab config: add new camerabox facing configs.

According to http://go/cros-camera-box#heading=h.yxp93d58v9fy, lab
should have corresponding label for each camerabox setup indicating
which camera facing of DUT'camera is facing to chart tablet's screen.

BUG=b:117858126
TEST=generate.sh

Change-Id: Iee1983a595175c1f820907f72aa867122d8efe9b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2111535
Reviewed-by: Xixuan Wu <xixuan@chromium.org>
Commit-Queue: Kuo Jen Wei <inker@chromium.org>
Tested-by: Kuo Jen Wei <inker@chromium.org>
2 files changed