msm: mdss: synchronize wfd driver iommu mmap/munmap with mdss

Add clocks reference during wfd driver iommu mdp_mmap/mdp_munmap
to ensure iommu is in proper state while wfd driver map/un-map
any buffers.

Change-Id: Id1a24285b81d5047e5e9f002ade9694ea49be59d
Signed-off-by: Pawan Kumar <pavaku@codeaurora.org>
diff --git a/include/linux/msm_mdp.h b/include/linux/msm_mdp.h
index f36ee04..45975f9 100644
--- a/include/linux/msm_mdp.h
+++ b/include/linux/msm_mdp.h
@@ -1,7 +1,7 @@
 /* include/linux/msm_mdp.h
  *
  * Copyright (C) 2007 Google Incorporated
- * Copyright (c) 2012-2013 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2012-2014 The Linux Foundation. All rights reserved.
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
@@ -1063,6 +1063,7 @@
 int msm_fb_writeback_stop(struct fb_info *info);
 int msm_fb_writeback_terminate(struct fb_info *info);
 int msm_fb_writeback_set_secure(struct fb_info *info, int enable);
+int msm_fb_writeback_iommu_ref(struct fb_info *info, int enable);
 #endif
 
 #endif /*_MSM_MDP_H_*/