Revert "libprocessgroup: move freezer to uid/pid hierarchy"

This reverts commit 1414a0d4d8.

Reason for revert: reversions of CLs from http://b/174776875 removed dependencies for this CL, and made the freezer non-functional. This CL has to be reverted as well

Bug:174776875
Change-Id: Idbd9532374bb661330b3c7546bbdf086a046aba3

libprocessgroup/profiles/cgroups.json

@@ -37,7 +37,7 @@
     "Controllers": [
       {
         "Controller": "freezer",
-        "Path": ".",
+        "Path": "freezer",
         "Mode": "0755",
         "UID": "system",
         "GID": "system"

libprocessgroup/profiles/task_profiles.json

@@ -46,7 +46,7 @@
       "File": "cpu.uclamp.latency_sensitive"
     },
     {
-      "Name": "Freezer",
+      "Name": "FreezerState",
       "Controller": "freezer",
       "File": "cgroup.freeze"
     }
@@ -70,11 +70,11 @@
       "Name": "Frozen",
       "Actions": [
         {
-          "Name": "SetAttribute",
+          "Name": "JoinCgroup",
           "Params":
           {
-            "Name": "Freezer",
-            "Value": "1"
+            "Controller": "freezer",
+            "Path": ""
           }
         }
       ]
@@ -83,11 +83,11 @@
       "Name": "Unfrozen",
       "Actions": [
         {
-          "Name": "SetAttribute",
+          "Name": "JoinCgroup",
           "Params":
           {
-            "Name": "Freezer",
-            "Value": "0"
+            "Controller": "freezer",
+            "Path": "../"
           }
         }
       ]