Merge remote-tracking branch 'origin/dev/msm-3.18-drm_kms' into msm-3.18

* origin/dev/msm-3.18-drm_kms:
  drm/msm: create separate commit thread for each display
  drm/msm: add error logging in msm_atomic

Change-Id: If1b6f16747a5785635a508ca845548b5db4e3df2
Signed-off-by: Jin Li <jinl@codeaurora.org>