Revert "github: Add plumbing of using the github workflow labeler"

This reverts commit 18cbd0dc81.

Revert this as the labeler workflow can't work on fork's right now so
its useless to us at this point.  Remove this plumbing for now and we
will wait and see if GitHub comes up with a solution for this.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>

.github/workflows/label.yml

@@ -1,19 +0,0 @@
-# This workflow will triage pull requests and apply a label based on the
-# paths that are modified in the pull request.
-#
-# To use this workflow, you will need to set up a .github/labeler.yml
-# file with configuration.  For more information, see:
-# https://github.com/actions/labeler/blob/master/README.md
-
-name: Labeler
-on: [pull_request]
-
-jobs:
-  label:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/labeler@v2
-      with:
-        repo-token: "${{ secrets.GITHUB_TOKEN }}"