Use String8/16 c_str am: e97a1ec320

Original change: https://android-review.googlesource.com/c/platform/system/libhwbinder/+/2704655

Change-Id: I1f55329409ad223d2f0494c70135029f1d5e20be
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>