msm: kgsl: Do not return invalid power stats when the device is off

adreno_power_stats() was returning unitialized data when the device
state was not active. Leave early from the function if the device
is not active and return 0s instead.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Prabhat Awasthi <pawasthi@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm8974: Add GPU frequency steps

* Do not initialize max freq to stock since we use
  devfreq path to control min-max freq.
* Instead apply stock freq via ramdisk.

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