[Do Not Merge] Update platform security string to 2017-10-01 in KLP dev Bug:64896113 am: f2f5343ba1 am: dafd187ab5 am: 47c92b6200  -s ours am: bc464d7e8f  -s ours
am: 5c68c85011

Change-Id: I7ce43a00a8dc3ab19aad0110c434ea5d92d9d6cf