PM: devfreq: Fix show available freqs

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>

Conflicts:
	drivers/devfreq/devfreq.c
PM: devfreq: Add conservative governor

A GPU governor is not rocket science. This one gets the job done pretty
smoothly while complying with devfreq framework rules.
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>

Conflicts:
	drivers/devfreq/Kconfig
	drivers/devfreq/Makefile
PM: devfreq: Add some conservativeness

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
PM: devfreq: conservative: Return 0 if GPU just started

Bailing out early is perfectly fine, so do not trigger an error in
update_devfreq.

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
PM: devfreq: Add sysfs nodes for devfreq governors

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>

Conflicts:
	drivers/devfreq/governor.h
	drivers/devfreq/governor_msm_adreno_tz.c
	drivers/devfreq/governor_simpleondemand.c