init.rc: remove bg_non_interactive cgroup [ DO NOT MERGE ]

We have seen cases when threads in this cgroup not scheduled for more than
a few seconds in heavy workload situation and causing device freeze.
In Linux, multiple threads placed in ROOT cgroup cause the CPU resource to
be split per thread, rather than per group.
Currently we have many threads in ROOT cgroup, which makes threads in
bg_non_interactive cgroup to have "tiny" CPU resource other than 5%
quota defined.

Bug: 34193533
Test: on marlin
Change-Id: I7721f6196560fbedf6265e8b6db130cec9edefd7

rootdir/init.rc

@@ -145,15 +145,6 @@ on init
     write /dev/cpuctl/cpu.rt_period_us 1000000
     write /dev/cpuctl/cpu.rt_runtime_us 950000
 
-    mkdir /dev/cpuctl/bg_non_interactive
-    chown system system /dev/cpuctl/bg_non_interactive/tasks
-    chmod 0666 /dev/cpuctl/bg_non_interactive/tasks
-    # 5.0 %
-    write /dev/cpuctl/bg_non_interactive/cpu.shares 52
-    write /dev/cpuctl/bg_non_interactive/cpu.rt_period_us 1000000
-    # active FIFO threads will never be in BG
-    write /dev/cpuctl/bg_non_interactive/cpu.rt_runtime_us 10000
-
     # sets up initial cpusets for ActivityManager
     mkdir /dev/cpuset
     mount cpuset none /dev/cpuset