[Benchmarking] Resharding perf platforms

This will cause some benchmarks to start running on
different devices on the waterfall than they used to
run on, which may cause discontinuities in the data
on the chromeperf dashboard. DO NOT REVERT this change
for any perf regression.

Update steps:
generate_perf_sharding.py update -w perf
generate_perf_sharding.py update-timing --filter-only

Please be aware that the timing data for win_7_nvidia_gpu_perf is not updated.

Bug: chromium:1030840
Change-Id: Ic53940c1fa7608edf57c4e1a596ef03eae333d62
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2080705
Commit-Queue: Wenbin Zhang <wenbinzhang@google.com>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748038}