Merge tag 'android-8.1.0_r50' into staging/lineage-15.1_merge-android-8.1.0_r50

Android 8.1.0 Release 50 (OPM7.181105.004)

* tag 'android-8.1.0_r50':
  Version bump to OPM7.181105.004
  Version bump to OPM7.181105.003
  [DO NOT MERGE] Update platform security string to 2018-11-05 on oc-mr1-dev bug:114110585 (cherry picked from commit 281cb3b1)
  Version bump to OPM7.181105.001
  [DO NOT MERGE] Update platform security string to 2018-11-01 on oc-mr1-dev Bug:114110585 (cherry picked from commit b703503c)

Change-Id: Id6bf362e3913d6e0abb297307254ccd95c418dca