Merge "[DO NOT MERGE] Updating Platform Security String to 2017-12-01 on mnc-dev. Bug: 67774760" into mnc-dev am: 948d98b31a am: c4a501ce0f
am: 0ef4e8a5e1

Change-Id: I28b0939a594d948330d2bd330c67b07dae4018a9