[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 am: c5287e96a4 am: 0412b3d0e3 am: 2df41e5dec am: 09ec3bc311  -s ours am: 9dbcf7c176 am: 3eac316736
am: 319003c0d8

Change-Id: Ice57fa9bb121fb12c3c6a0e29f89e06b7348e07c