[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 am: 595b11f9b8 am: dc48c433d5 am: 3dd51fb95a am: 223d59710e am: 19709747d8  -s ours am: 0693cd362b
am: 9f76abf94d

Change-Id: If2052a0876013f761929af9497ae87b8cbbe8b22