[Do Not Merge] Update platform security string to 2017-10-01 in KLP dev...

[Do Not Merge] Update platform security string to 2017-10-01 in KLP dev Bug:64896113 am: f2f5343b am: dafd187a am: 47c92b62  -s ours am: bc464d7e  -s ours am: 5c68c850 am: f1f39061  -s ours am: c5287e96 am: 0412b3d0 am: 2df41e5d am: 09ec3bc3  -s ours am: 9dbcf7c1 am: 3eac3167 am: 319003c0
am: 2b7d9b23

Change-Id: Idda8e5aaf54386d08a6e09b439e60212d4184087