PM / devfreq: Fix simple_ondemand crashing

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
PM: devfreq: Add sysfs nodes for devfreq governors

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
PM: devfreq: Fix show available freqs

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>