Merge tag 'android-9.0.0_r52' into staging/lineage-16.0_merge-android-9.0.0_r52

Android 9.0.0 release 52

* tag 'android-9.0.0_r52':
  FlattenableUtils::align memsets
  Fix a memory leak in gatekeeper.
  Export maximum number of fds/ints in a native_handle.

Change-Id: I1921aea5c156930eaddf654dd6c95c48241b9bd3