cpufreq: Export user_policy min/max
Add sysfs nodes for user_policy min and max settings.

Bug 888312

Signed-off-by: Antti P Miettinen <amiettinen@nvidia.com>
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Signed-off-by: renderbroken <zkennedy87@gmail.com>

Conflicts:
	drivers/cpufreq/cpufreq.c