Bug 1526584: [win64-aarch64] Only add win64-aarch64 platform to balrog blog for firefox; r=mtabara

This reverts the refactoring in 0734f7d57cd81464053e7ffacc8897fce1a27d61 so only the firefox blob
gets the new platform. This was causing failure in the subsequent release promotion task, as it made
assumptions about the structure of the balrog blob.

Differential Revision: https://phabricator.services.mozilla.com/D21494

--HG--
extra : moz-landing-system : lando

taskcluster/ci/release-balrog-submit-toplevel/kind.yml

@@ -26,7 +26,6 @@ job-defaults:
          by-release-level:
             production: download.mozilla.org
             staging: bouncer-bouncer-releng.stage.mozaws.net
-      platforms: ["linux", "linux64", "macosx64", "win32", "win64", "win64-aarch64"]
    whats-new-config: browser/config/whats_new_page.yml
 
 jobs:
@@ -62,6 +61,7 @@ jobs:
                release(-rc)?: ["firefox-release-cdntest", "firefox-release-localtest"]
                esr60: ["firefox-esr60-cdntest", "firefox-esr60-localtest"]
                default: []
+         platforms: ["linux", "linux64", "macosx64", "win32", "win64", "win64-aarch64"]
       treeherder:
          platform: firefox-release/opt
          symbol: Rel(BPFx)
@@ -81,6 +81,7 @@ jobs:
                production: [521]
                staging: [521]
          rules-to-update: ["esr52-cdntest", "esr52-localtest"]
+         platforms: ["linux", "linux64", "macosx64", "win32", "win64"]
          blob-suffix: -bz2
          complete-mar-filename-pattern: '%s-%s.bz2.complete.mar'
          complete-mar-bouncer-product-pattern: '%s-%s-complete-bz2'
@@ -100,6 +101,7 @@ jobs:
          channel-names: ["aurora", "aurora-localtest", "aurora-cdntest"]
          publish-rules: [10]
          rules-to-update: ["devedition-cdntest", "devedition-localtest"]
+         platforms: ["linux", "linux64", "macosx64", "win32", "win64"]
       treeherder:
          platform: devedition-release/opt
          symbol: Rel(BPDev)