[DO NOT MERGE] Update security string to 2018-02-01 for lmp-mr1-dev...

[DO NOT MERGE] Update security string to 2018-02-01 for lmp-mr1-dev bug:70348883 am: fedac8db  -s ours am: b22c5633 am: d572ee7e am: a67af52d am: a645938f  -s ours am: 229da9d2 am: 590a4d3c am: 81f33be9 am: 6fb0dd12 am: 7681838a  -s ours am: c282e032 am: 6f9cbc5f am: e0d33135
am: 24063bc0  -s ours

Change-Id: Ia2d9e25fc84702f7993e58ebdc3d46c5adbac343