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

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I32722ae3a7f5fbde2aa7d42402f8f2d670423f4b