Revert "Freeze all package processes before killing"

This reverts commit 6eff4d8f1b.

Reason for revert: b/236266655 zygote for a new process spawns in different process group before moving, which causes permanent freeze of all zygote processes.

Change-Id: Icd245a3a23bda26659b81a8b5b24682655649222

services/core/java/com/android/server/am/ProcessList.java

@@ -2792,15 +2792,6 @@ public final class ProcessList {
         }
 
         int N = procs.size();
-        for (int i = 0; i < N; ++i) {
-            final ProcessRecord proc = procs.get(i).first;
-            try {
-                Process.setProcessFrozen(proc.getPid(), proc.uid, true);
-            } catch (Exception e) {
-                Slog.w(TAG, "Unable to freeze " + proc.getPid() + " " + proc.processName);
-            }
-        }
-
         for (int i=0; i<N; i++) {
             final Pair<ProcessRecord, Boolean> proc = procs.get(i);
             removeProcessLocked(proc.first, callerWillRestart, allowRestart || proc.second,