msm-fb: display: ION based allocation for writeback buffers

ION based allocation is added for the writeback support
for content security.

Change-Id: Iaa7ec07a7cbc05c818af6f26a2c42c8c36b9bcb5
Signed-off-by: Nagamalleswararao Ganji <nganji@codeaurora.org>
diff --git a/include/linux/msm_mdp.h b/include/linux/msm_mdp.h
index 0c09799..d8c2edb 100644
--- a/include/linux/msm_mdp.h
+++ b/include/linux/msm_mdp.h
@@ -139,9 +139,10 @@
 #define MDP_DEINTERLACE_ODD		0x00400000
 #define MDP_OV_PLAY_NOWAIT		0x00200000
 #define MDP_SOURCE_ROTATED_90		0x00100000
-#define MDP_BORDERFILL_SUPPORTED	0x00010000
-#define MDP_MEMORY_ID_TYPE_FB		0x00001000
 #define MDP_DPP_HSIC			0x00080000
+#define MDP_BORDERFILL_SUPPORTED	0x00010000
+#define MDP_SECURE_OVERLAY_SESSION      0x00008000
+#define MDP_MEMORY_ID_TYPE_FB		0x00001000
 
 #define MDP_TRANSP_NOP 0xffffffff
 #define MDP_ALPHA_NOP 0xff