[DO NOT MERGE] Update platform security string to 2017-10-01 in lmp-dev Bug:64896113 am: cf83f5a4f3  -s ours am: b40465ed59 am: acc7e47faa  -s ours am: 286c80e90a
am: 3b9a25dc46

Change-Id: I7066b5941ac25cc276e7dabff6ae9be9aab50c9a