Remove unused libprocessgroup dependency am: 2dc99691ff am: 07b0088db7

Original change: https://android-review.googlesource.com/c/platform/system/libhidl/+/3455940

Change-Id: I696288d4f2cfab85d667a35e548464fe169f064e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>