drm/msm/sde: request affine cores mask from pm_qos

Add support for requesting a cpu dma latency QoS level from
pm_qos to hold desired cores at a particular QoS level.

Change-Id: Idee01f19af4c8c9e235e0b1a177cd0602847c9dc
Signed-off-by: Lloyd Atkinson <latkinso@codeaurora.org>