[automerge] powerhint: remove powerhint.json for separating configs 2p: eea7b26d08

Original change: https://googleplex-android-review.googlesource.com/c/device/google/gs101/+/16687457

Bug: 215655510
Change-Id: Idbbc763b97de7e123769fdc53547d72a7e83ddba
Merged-In: Ie1cb4e4c0fd3fc0abbba1e721cc7f66841265e98