Remove unused libprocessgroup dependency am: e8b2962bc2

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NeuralNetworks/+/3454664

Change-Id: I72869542347abb9837d7d8e1fe378b0e8cea99a1
Signed-off-by: Automerger Merge Worker <[email protected]>