Rip out getProcessAgeMs. am: 489e7571db am: 31eadaacbf

Original change: https://android-review.googlesource.com/c/platform/system/libhidl/+/1556385

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I60381421f4f614f878e8c9132f76a2e5fea0ee7e