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This benchmark does not need to be run on other platforms.

Also fix a minor bug in generate_perf_sharding that caused
problems for shards that don't have any telemetry benchmarks
on them.

Bug: 1047129
Change-Id: I72f58194ef35a8482fe358dcd99b307c4cdf5c8b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2039170
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Auto-Submit: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738628}