Merge "Introduce security.lower_kptr_restrict property" am: 24a21867e7 am: 8ff9efc482 am: 47319cec95

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1455185

Change-Id: Ib235c80b749502e397e6d33877b939a9714eb5cb