Merge "Add per-file OWNERS for ChargeCalculators" am: e191d88136 am: 7526d5687c

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1621724

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ib8b1efe14f542d922614121c4f9b1ffd4f2a61a6