Merge "Migrate String8/16 from .string() to c_str()" into main am: 6bfa6a02

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2703570



Change-Id: I18160135a4dd29528e7723553054d17586b74e01
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>