Revert "[tools/perf] Enable proxy power metric on Pixel 4a bots"

This reverts commit d4e2b4da.

Reason for revert: Causes failures on the android-pixel4a_power-perf bot.

Original change's description:
> [tools/perf] Enable proxy power metric on Pixel 4a bots
>
> This CL supplies two command-line flags that are necessary to compute
> the proxy power metric (based on CPU usage and power profiles).
>
>  * --fetch-power-profile downloads the power profile from the cloud.
>
>  * --performance-mode=keep disables the Telemetry power management,
>  making it possible to collect cpu_freq events. Note that there will
>  likely be a drop in observed power rails metrics after this CL lands,
>  because devices will use more efficient CPU scheduling policy.
>
> Change-Id: I9aeecd80cda1a883e1994ba70b0a439cd83f8749
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2566995
> Reviewed-by: John Chen <johnchen@chromium.org>
> Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
> Cr-Commit-Position: refs/heads/master@{#832770}

Bug: 1154788
TBR=johnchen@chromium.org,khokhlov@google.com,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: Ifdf838140e4cb2fb8bf5df321819a0d6901e299c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2589858Reviewed-by: Mikhail Khokhlov <khokhlov@google.com>
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836753}

testing/buildbot/chromium.perf.json

@@ -660,9 +660,7 @@
           "--browser=android-chrome",
           "--upload-results",
           "--test-shard-map-filename=android-pixel4a_power-perf_map.json",
-          "--experimental-tbmv3-metrics",
-          "--fetch-power-profile",
-          "--performance-mode=keep"
+          "--experimental-tbmv3-metrics"
         ],
         "isolate_name": "performance_test_suite",
         "merge": {

tools/perf/core/perf_data_generator.py

@@ -527,12 +527,9 @@ BUILDERS = {
     },
     'android-pixel4a_power-perf': {
         'tests': [{
-            'isolate':
-            'performance_test_suite',
+            'isolate': 'performance_test_suite',
             'extra_args': [
                 '--experimental-tbmv3-metrics',
-                '--fetch-power-profile',
-                '--performance-mode=keep',
             ],
         }],
         'platform':