[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

Change-Id: I5fb22683f6e499656cbabd3ae452391fefff1ca9