[automerge] Partial Revert "powerhint: remove powerhint.json for separating configs" 2p: feb6fd3e0f

Original change: https://googleplex-android-review.googlesource.com/c/device/google/gs101/+/16811163

Bug: 215655510
Change-Id: Iee95c52a8a69a3e3ab9f5f5a11d6069052f41b59
Merged-In: Ied6e98e39481775d17efa8c3741a99eaf3fab2b8