test_platform: Remove deprecated scheduler split response

BUG=chromium:1038806
TEST=./generate.sh

Change-Id: I5bfe44d0281e4dbde163746746e9f9890d8356a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/1991719
Tested-by: Prathmesh Prabhu <pprabhu@chromium.org>
Reviewed-by: Alex Zamorzaev <zamorzaev@chromium.org>
Commit-Queue: Prathmesh Prabhu <pprabhu@chromium.org>
3 files changed