Speed up release deploys (mapbox#9298)

Author: kkaefer

.circleci/config.yml

@@ -278,10 +278,6 @@ jobs:
           command: |
             function upload {
                 aws s3 cp --acl public-read --content-type $2 dist/$1 s3://mapbox-gl-js/$CIRCLE_TAG/$1
-
-                AWS_ACCESS_KEY_ID=$AWSCN_ACCESS_KEY_ID \
-                AWS_SECRET_ACCESS_KEY=$AWSCN_SECRET_ACCESS_KEY \
-                aws s3 cp --region cn-north-1 --acl public-read --content-type $2 dist/$1 s3://mapbox-gl-js-cn-north-1/$CIRCLE_TAG/$1
             }
 
             upload mapbox-gl.js     application/javascript