test_platform: Drop deprecated field from phosphorus API

BUG=None
TEST=./generate.sh

Change-Id: I04ba3dfc6053bd1ff72f5f65e2e3382e1ffb8064
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2567711
Auto-Submit: Prathmesh Prabhu <pprabhu@google.com>
Commit-Queue: Sean Abraham <seanabraham@chromium.org>
Reviewed-by: Sean Abraham <seanabraham@chromium.org>
2 files changed