Re-enable PCv2 on known-to-work platforms Mac/Linux

BUG=615178

Review-Url: https://codereview.chromium.org/2024103005
Cr-Commit-Position: refs/heads/master@{#397048}

tools/perf/benchmarks/page_cycler_v2.py

@@ -28,7 +28,7 @@ class _PageCyclerV2(perf_benchmark.PerfBenchmark):
     return tbm_options
 
 
-@benchmark.Disabled('all')  # crbug.com/615178
+@benchmark.Disabled('win', 'android')  # crbug.com/615178
 class PageCyclerV2Typical25(_PageCyclerV2):
   """Page load time benchmark for a 25 typical web pages.