Merge tag 'android-9.0.0_r21' into lineage-16.0-android-9.0.0_r21

Android 9.0.0 release 21

* tag 'android-9.0.0_r21':
  DO NOT MERGE: lmkd: retune rate at which processes are killed
  lmkd: rate-limit and cleanup failed kill reports

Change-Id: I6de27b542bb222924dc7c6b5d13dd3d4950ee164