[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 am: 229da9d2f2 am: 590a4d3c6a am: 81f33be96c am: 6fb0dd12a6
am: 7681838a52  -s ours

Change-Id: I42bc16aeb408eb27d6476f97a8406a6c2f367590