Merge tag 'android-8.1.0_r80' into staging/lineage-15.1_merge-android-8.1.0_r80

Android 8.1.0 release 80

* tag 'android-8.1.0_r80':
  Use FLAG_IMMUTABLE for CarrierKeyDownloadManager
  Use FLAG_IMMUTABLE for CarrierServiceStateTracker
  Use FLAG_IMMUTABLE for InboundSmsHandler
  Use FLAG_IMMUTABLE
  Restrict access to the resolution PendingIntent created by EuiccController to EuiccResolutionUiDispatcherActivity
  Added FLAG_IMMUTABLE flag for security purposes
  DO NOT MERGE: Update ConnectivityServiceMock for VPN meteredness bug
  Fixed invalid pdu issue

Change-Id: I57d0d4260ce7480b24b424912d308410f80bf7c8