msm: kgsl: Wake gpu up on the max freq when using the performance governor

Use the flag provided by the performance governor on the device
suspend/slumber to wake it up later on the max gpu frequency.

Change-Id: Ia8284458ffe9cd17eb8e87b2eb84c485ae6e8afa
Signed-off-by: Vladimir Razgulin <vrazguli@codeaurora.org>