[automerger skipped] Do not purge process groups on system_server startup am: 7b7d5758 -s ours

am skip reason: Merged-In I2e50f53c9692424c994c0b4ee6f1e2762632c3bc with SHA-1 2239be87 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18091725



Change-Id: Ia924f6b6dfdf20420100a92b0108d820529e1069
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>