Use String8/16 c_str [audio mainline modules] am: 946a39f9 am: 36619085

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/24437201



Change-Id: Ifbf665340c9631f9f9d172e5332389091542b47e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>