Rip out getProcessAgeMs. am: 489e7571db am: 31eadaacbf am: a79f392ccb

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I44320b6e7505dd54907451f1f6d1c7babf40b380