Revert "libprocessgroup: Combine all 3 ActivateControllers imple..."

Revert submission 3212512

Reason for revert: Droidmonitor created revert due to b/372273614. Will be verifying through ABTD before submission.

Reverted changes: /q/submissionid:3212512

Change-Id: I3dadc0b7bccfe28bb067a93df2acf2c3ea0f9920
diff --git a/libprocessgroup/processgroup.cpp b/libprocessgroup/processgroup.cpp
index d3719ee..83a2258 100644
--- a/libprocessgroup/processgroup.cpp
+++ b/libprocessgroup/processgroup.cpp
@@ -662,9 +662,10 @@
         return -errno;
     }
     if (activate_controllers) {
-        if (!CgroupMap::GetInstance().ActivateControllers(uid_path)) {
-            PLOG(ERROR) << "Failed to activate controllers in " << uid_path;
-            return -errno;
+        ret = CgroupMap::GetInstance().ActivateControllers(uid_path);
+        if (ret) {
+            LOG(ERROR) << "Failed to activate controllers in " << uid_path;
+            return ret;
         }
     }