Revert "Use libaoc to provide consistent timestamp calculations" am: 33552445b8

Original change: https://googleplex-android-review.googlesource.com/c/device/google/gs-common/+/18817091

Change-Id: I707cabef3056776f2de4348c01743c6e8d91d77c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>