drm/msm: remove pm_runtime_put() calls

The drm msm driver isn't pm_runtime adapted yet. Since gdsc is now associated
with pm_runtime, we need to make sure we don't do a pm_runtime_put() when we
are using the hardware.

This can be removed after pm_runtime adaptation.

Signed-off-by: Archit Taneja <architt@codeaurora.org>

Conflicts:
	drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c