Bug 1886168 - Run sp3 tests daily against p6 and s21 on geckoview. r=perftest-reviewers,sparky

In this bug we want to enable sp3 to run daily on the p6 and s21 on fenix, geckoview and chrome
Since chrome and fenix are already running regularly due to other patches this is just running geckoview regularly

Differential Revision: https://phabricator.services.mozilla.com/D205565

taskcluster/ci/test/browsertime-mobile.yml

@@ -419,6 +419,8 @@ browsertime-benchmark-speedometer3-mobile:
             geckoview:
                 by-test-platform:
                     android-hw-a51.*shippable-qr.*: [trunk-only]
+                    android-hw-p6.*shippable-qr.*: [mozilla-central]
+                    android-hw-s21.*shippable-qr.*: [mozilla-central]
                     default: []
             cstm-car-m: [mozilla-central]
             chrome-m:

testing/perfdocs/generated/raptor.rst

@@ -5568,7 +5568,7 @@ Standard benchmarks are third-party tests (i.e. Speedometer) that we have integr
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       * - **browsertime-benchmark-speedometer3-mobile-geckoview-nofis**
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@@ -5599,7 +5599,7 @@ Standard benchmarks are third-party tests (i.e. Speedometer) that we have integr
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@@ -5964,7 +5964,7 @@ Standard benchmarks are third-party tests (i.e. Speedometer) that we have integr
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@@ -5995,7 +5995,7 @@ Standard benchmarks are third-party tests (i.e. Speedometer) that we have integr
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       * - **browsertime-benchmark-speedometer3-mobile-geckoview-nofis**
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