[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
am: f1f39061a7  -s ours

Change-Id: I581219ddf6a09b037122c6eb4650392ae01b3737