init.rc: remove initializations to cg2_bpf path

https://r.android.com/c/1324649/5 moves the cgroup folder to its sysfs
path. Directory access rights are defined by kernel code and sepolicy,
so remove the initialization lines from init.rc.

Test: manually booted the device and verified access rights for
/sys/fs/cgroup
Bug: 154548692

Change-Id: I67284dc651ed529cae69e413b66c6e1292a2d970
Merged-In: I67284dc651ed529cae69e413b66c6e1292a2d970