Merge tag 'android-8.1.0_r72' into staging/lineage-15.1_merge-android-8.1.0_r72

Android 8.1.0 release 72

* tag 'android-8.1.0_r72':
  FlattenableUtils::align memsets
  Fix a memory leak in gatekeeper.
  Export maximum number of fds/ints in a native_handle.
  String16: remove integer overflows
  libnetutil: Check dhcp respose packet length

Change-Id: Ia2c6a4fdcb859fe1735caefef7ea9db40b48225b