PM QoS: Add GPU frequency limits to PM QoS

Added GPU frequency min/max as PM QoS classes.

Bug 1330780

Signed-off-by: Alex Frid <afrid@nvidia.com>
Reviewed-on: http://git-master/r/267702
Reviewed-by: Ilan Aelion <iaelion@nvidia.com>
Reviewed-by: Mitch Luban <mluban@nvidia.com>
Reviewed-by: Yu-Huan Hsu <yhsu@nvidia.com>

Change-Id: I2428c62748521c17e23b2df9ca409deda8b36160