Upgrade libtracefs to libtracefs-1.6.4 am: eee6e409c7 am: 1da5104322

Original change: https://android-review.googlesource.com/c/platform/external/libtracefs/+/2394014

Change-Id: I74d3e075451e64144124f61af4b68e45b5295ead
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>