[DO NOT MERGE] Update security string to 2018-02-01 for lmp-mr1-dev bug:70348883 am: fedac8dbc2  -s ours am: b22c56332f am: d572ee7efa am: a67af52d8c
am: a645938f45  -s ours

Change-Id: I18294ae07d2f8a5559e9a6f5c67564bb80c5d001