[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 am: 9f7048b3b5
am: 7c50949d13  -s ours

Change-Id: Ic87fb7997d16d0ffd53a9c5e0832d315ac641130