drm/msm: atomic fixes

Fixes for a couple little issues found in testing.

Signed-off-by: Rob Clark <robdclark@gmail.com>

diff --cc drivers/gpu/drm/msm/msm_atomic.c
Simple merge

diff --cc drivers/gpu/drm/msm/msm_fb.c
Simple merge

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