cpufreq: Fix broken uevents for cpufreq governor and cpu devices

cyanogens uevent commit when the governor changes was rendered
non-working since kitkat (or so) as the uevent filter function
caused events to be dropped. Now hook into cpufreq_core_init()
and cpufreq_add_dev_interface() to create our basic ksets for
cpufreq and cpu devices. Also, we don't need to set environmental
data, so clean it up a bit.

This commit requires a change in ueventd.rc that add rules for
several files of interest.

Conflicts:
	drivers/cpufreq/cpufreq.c

Change-Id: I3aafa0d4e18363e1d68535f513099ecd27024007
drivers: cpufreq: Send a uevent when governor changes

* Useful so userspace tools can reconfigure.

Change-Id: I74df7982ae1a4572a9c5b96914f76931e48489af
Revert "drivers: cpufreq: Send a uevent when governor changes"

This reverts commit f20c421544fcd3eec18701fec8ec396d989ba344.

Change-Id: Ie98eb9c9bfec7eedb57b0656cba004ed251ff483
Merge branch 'cm-11.0' into kk_mkt