Merge "Lock down String8|16.string() usage" into main am: f9cae2c965

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2706173

Change-Id: Ic519e62493159876aa73a576f0fa564fce5003a3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>