Merge tag 'android-9.0.0_r61' into staging/lineage-16.0_merge-android-9.0.0_r61

Android 9.0.0 Release 61 (6780336)

* tag 'android-9.0.0_r61':
  Add missing isShellUser check
  Mark implicit PendingIntents as immutable
  Require a more specific intent
  RESTRICT AUTOMERGE Do not set referrerUri on SessionInfo for non-owners
  Remove unused intent in NiNotification