Bug 1566423 - Run Android 7.0 TV against geckoview; r=jmaher

As soon as xpcshell is switched over to geckoview, we can do the same for android TV.

Differential Revision: https://phabricator.services.mozilla.com/D42905

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

taskcluster/ci/test/misc.yml

@@ -96,6 +96,10 @@ test-verify:
             macosx.*64(?:-qr)?/opt: ['mozilla-central', 'try']
             # do not run on beta or release: usually just confirms earlier results
             default: ['trunk', 'try']
+    target:
+        by-test-platform:
+            android-em-7.*: geckoview-androidTest.apk
+            default: null
     tier: 2
     mozharness:
         script: