Merge "libprocessgroup: Convert libprocessgroup_util to static library" into main am: 3081d1d0

Original change: https://android-review.googlesource.com/c/platform/system/core/+/3212509



Change-Id: Ib91e02d1681580b4e49271f66f45296b2757343c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>