drm/msm: switch to atomic-helpers iterator macros

Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --cc drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c
Simple merge

diff --cc drivers/gpu/drm/msm/mdp/mdp5/mdp5_crtc.c
Simple merge

diff --cc drivers/gpu/drm/msm/msm_kms.h
Simple merge