Merge "KernelWakelockReader: provide class level lock when updates staleStats" am: b9f60a53c3 am: ec13727383 am: 7805396ee6

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1534034

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I4ef1ab620b8a56e62c295d081f714de208d9fa57