power/stats: Rename readEnergyMeters to readEnergyMeter am: eef94f8f4f

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1576534

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I0b30a65c2b951a97bcf496145d8677d7b0f68e25