Upgrade libtraceevent to libtraceevent-1.8.4 am: 4883ef8303 am: 3be6c1908e

Original change: undetermined

Change-Id: Ibb749550e0feac6af97a22178d2acf62ac83a6ab
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>