[test] Roll out new test runner to arm64 bots

TBR=sergiyb@chromium.org

Bug: v8:7343
Change-Id: Id17a931e00eda0bf018b5f1cb1cd6bac516ec26d
Reviewed-on: https://chromium-review.googlesource.com/881482Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50811}

tools/testrunner/standard_runner.py

@@ -91,7 +91,11 @@ BUILDER_WHITELIST_STAGING = {
     re.compile(r'V8 Mac.*'),
     re.compile(r'V8 Win.*'),
   ],
+  'client.v8.ports': [
+    re.compile(r'V8 Linux - arm64.*'),
+  ],
   'tryserver.v8': [
+    re.compile(r'v8_linux_arm64.*'),
     re.compile(r'v8_linux64.*'),
     re.compile(r'v8_mac.*'),
     re.compile(r'v8_win.*'),