Revert 49a7fa to remove fake AWS creds

I tested the changes @imjasonh made in adf030 without these fake aws
credentials and it does appear that the ten minutes slow down we were
observing in tektoncd#4087 are fixed.

This PR backs out the phony AWS creds that were in place on the
controller to work around long delays on initial image fetches for
entrypoint lookup (and bundles) related to k8schain.

config/controller.yaml

@@ -93,17 +93,6 @@ spec:
           valueFrom:
             fieldRef:
               fieldPath: metadata.namespace
-        # These phony AWS credentials are here to work around a bug in the aws go sdk
-        # that causes extremely long delays in the execution of tasks after the initial
-        # deployment of the Tekton Pipelines controller. See issue https://github.com/tektoncd/pipeline/issues/4087
-        # for more information.
-        - name: AWS_ACCESS_KEY_ID
-          value: foobarbaz
-        - name: AWS_SECRET_ACCESS_KEY
-          value: foobarbaz
-        - name: AWS_DEFAULT_REGION
-          value: foobarbaz
-
         # If you are changing these names, you will also need to update
         # the controller's Role in 200-role.yaml to include the new
         # values in the "configmaps" "get" rule.