Use String8/16 c_str am: 441ceef0d3 am: ca94928e5e

Original change: https://android-review.googlesource.com/c/device/google/contexthub/+/2705756

Change-Id: I9aa87aed26524f3bf237d98f232a741c43417b5d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>