[automerge] Grant getpgid to system_server on zygote 2p: c816666f40

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/sepolicy/+/16743651

Bug: 216097542
Change-Id: Id15bbd4f7bdb7fd02ef0f67b8065c0306d42e59e