head tracking processor: improve log am: f8a8526d70

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/21085783

Change-Id: Ifcc5c985837ee87c743e790eea7d069ac9fc95e9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>