manifest: Track our own external/ppp

* Necessary in order to patch CVE-2020-8597

Change-Id: I482a1b12d1e613901b774e786f8aab1858ac7295
1 file changed
tree: 9ce7b505c7e48c53bd8bf763ed46d63eb73c451e
  1. snippets/
  2. default.xml
  3. README.mkdn