sepolicy: perf: sepolicy fixes forcpufreq and devfreq nodes.

This change is the squash of following sepolicy denial fixes
and are propagated from 'O'.

1. sepolicy: update devfreq nodes with secontext
   Update devfreq nodes with sysfs_devfreq label

2. se_policy: add sepolicy label to cpufreq and devfreq nodes
   Enable the sepolicy for init script to configure cpufreq and devfreq.

3. se_policy: add sysfs_devfreq label for l3 memlat nodes
   Add sysfs_devfreq label for l3 memlat node to give
   permission for init post boot script.

CRs-Fixed: 2159655 2167034 2169152

Squash of following Change-Ids:
    Change-Id: I6853328652ceeafe1aabdd4631f15ae73c5a335e
    Change-Id: Ic37bc1febd93214e3a286f13ae8e8796f6f9c796
    Change-Id: I5f7630ae5633e8943f6bb22a57c7b69a0ea70abb

Change-Id: If159876ea067b1f0cb626f9f1b7ba2d94ac80cd5