Copy to std::string when parsing LE audio config am: 37681976

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/17958688



Change-Id: I49743a0c64e1dad8b86b0c8b373cd83355799702
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>