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Add function on perf_data_generator to keep the list of active platform
configurations in //docs/speed/perf_lab_platforms.md up to date.

Bug: 871746
Cq-Include-Trybots: master.tryserver.chromium.perf:obbs_fyi
Change-Id: I8d95651ad0480f7eb21b8aa6c95af5b75d37da94
Reviewed-on: https://chromium-review.googlesource.com/1166919
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#583244}