msm_fb: display: Add support for 4 layer MDP composition

Add 4 layers composition support to MDP by allowing borderfill
pipe to be used as base layer of mdp blending. This releases
RGB1 base pipe which can be used as a general purpose pipe.

Change-Id:I517485d738e8bb555a263b3ea885d78d5e4f4396
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
diff --git a/include/linux/msm_mdp.h b/include/linux/msm_mdp.h
index a0af4b5..f757fae 100644
--- a/include/linux/msm_mdp.h
+++ b/include/linux/msm_mdp.h
@@ -99,6 +99,7 @@
 	MDP_YCRCB_H1V1,   /* YCrCb interleave */
 	MDP_YCBCR_H1V1,   /* YCbCr interleave */
 	MDP_IMGTYPE_LIMIT,
+	MDP_RGB_BORDERFILL,	/* border fill pipe */
 	MDP_BGR_565 = MDP_IMGTYPE2_START,      /* BGR 565 planer */
 	MDP_FB_FORMAT,    /* framebuffer format */
 	MDP_IMGTYPE_LIMIT2 /* Non valid image type after this enum */