Merge "Revert "Revert "Lock down String8|16.string() usage""" into main am:...

Merge "Revert "Revert "Lock down String8|16.string() usage""" into main am: 8c9c7d07 am: 8703cb8e am: 80ce21e6 am: d4d78d41

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2752223



Change-Id: Id130a4d1c08ae9d36c5b39775eefa80409dc4d28
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>