[automerger skipped] Don't test pw_shell for old vendor images am: 4785c13549 -s ours

am skip reason: Change-Id Ie485bd019b3826e71ad19131effcbb002f888d52 with SHA-1 b9fa04d805 is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/bionic/+/12133446

Change-Id: I456220a914c602b5fc6b88dccf8dcfbcae0a3f8c