Upgrade libtracefs to libtracefs-1.8.1 am: b6c97c53a6 Original change: https://android-review.googlesource.com/c/platform/external/libtracefs/+/3470320 Change-Id: I0f388d417cac314e64eb34b232582e78d8eef2c9 Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>