Merge tag 'android-8.1.0_r46' into staging/lineage-15.1_merge-android-8.1.0_r46

Android 8.1.0 Release 46 (OPM6.171019.030.K1)

* tag 'android-8.1.0_r46':
  Updating Platform Security String to 2018-09-05 Bug: 111501777 (cherry picked from commit 6bc223c9)
  [DO NOT MERGE] Update Platform Security String to 2018-08-05 for August Bug:109889880 (cherry picked from commit f6bee62b)
  DO NOT MERGE: Update Platform Security String to 2018-07-05 for oc-mr1-dev Bug:79883349 (cherry picked from commit cfbe84b8)
  DO NOT MERGE: Updating security string for oc-mr1-dev to 2018-06-05

Change-Id: I42881615653bc13b438b10cedf2077ea9bea782b