init.rc: Remove cpu weight set on the root cgroup

It isn't allowed to change the cpu.share value for the root cgroup.
See kernel commit:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ec7dc8ac73e4a56ed03b673f026f08c0d547f597

This fixes the following error seen in dmesg:
init: write_file: Unable to write to '/dev/cpuctl/cpu.shares': Invalid argument

BUG: 28735908

Change-Id: I5ef359fb275792f99d13d35c62499026d354f6af
Signed-off-by: Irina Patru <irina.patru@intel.com>
diff --git a/rootdir/init.rc b/rootdir/init.rc
index aa32343..ef70bf2 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -140,7 +140,6 @@
     chown system system /dev/cpuctl
     chown system system /dev/cpuctl/tasks
     chmod 0666 /dev/cpuctl/tasks
-    write /dev/cpuctl/cpu.shares 1024
     write /dev/cpuctl/cpu.rt_runtime_us 800000
     write /dev/cpuctl/cpu.rt_period_us 1000000