[automerge] Ensure policy has no absurdly long strings 2p: 12c201509e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23033896

Bug: 260729089
Change-Id: I1069254fdb7f0d18feaeaf090f26399712047205
Merged-In: Idcf54e408722f164d16bf2f24a00cd1f5b626d23