Android 8.1.0 release 31
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Delete /mnt/sdcard symlink am: 17f0fbd
am: 99feb61

* commit '99feb6138f39e392495057ef7f2c4a5ed27f9e2d':
  Delete /mnt/sdcard symlink

Change-Id: I4a5af549cf4c066a5da0b1364a0b944dc233798b