Revert "init: create native cgroup"

This reverts commit 3f8c938.

The tasks created outside the android framework are moved to
"native" cgroup from "root" cgroup, which otherwise have more
CPU scheduling share compared to tasks in "apps" cgroup.
The "apps" cgroup is removed in Android 5.1 release. Now all
tasks except background (low priority) tasks are run under root.
The tasks under "native" cgroup are experiencing higher scheduling
latency compared to other tasks. Remove "native" cgroup as it is
not required anymore.

Change-Id: I4c194dc8db5e8b2e34c776020a8c94e0aec3b0b4

rootdir/etc/init.qcom.post_boot.sh

@@ -1118,36 +1118,3 @@ case "$target" in
         echo $oem_version > /sys/devices/soc0/image_crm_version
         ;;
 esac
-
-# Create native cgroup and move all tasks to it. Allot 15% real-time
-# bandwidth limit to native cgroup (which is what remains after
-# Android uses up 80% real-time bandwidth limit). root cgroup should
-# become empty after all tasks are moved to native cgroup.
-
-CGROUP_ROOT=/dev/cpuctl
-mkdir $CGROUP_ROOT/native
-echo 150000 > $CGROUP_ROOT/native/cpu.rt_runtime_us
-
-# We could be racing with task creation, as a result of which its possible that
-# we may fail to move all tasks from root cgroup to native cgroup in one shot.
-# Retry few times before giving up.
-
-for loop_count in 1 2 3
-do
-	for i in $(cat $CGROUP_ROOT/tasks)
-	do
-		echo $i > $CGROUP_ROOT/native/tasks
-	done
-
-	root_tasks=$(cat $CGROUP_ROOT/tasks)
-	if [ -z "$root_tasks" ]
-	then
-		break
-	fi
-done
-
-# Check if we failed to move all tasks from root cgroup
-if [ ! -z "$root_tasks" ]
-then
-	echo "Error: Could not move all tasks to native cgroup"
-fi