Merge "power/stats: Add default implementation" am: 492edf2acf am: 52f8fda5ae am: d81eb1330c

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1612583

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I7c9e7e88ea518161616c337ca65e05762b0d047d