display : Add support for copybit composition

This change add support for copybit composition in display HAL
for MDP3 targets.

Change-Id: I9bc8e40f624b0760f4faa223cb03a13695611bb3
Acked-by: Sravan Kumar D.V.N <sravank1@codeaurora.org>
diff --git a/libcopybit/copybit.h b/libcopybit/copybit.h
index 6384dfe..c14af74 100644
--- a/libcopybit/copybit.h
+++ b/libcopybit/copybit.h
@@ -52,6 +52,10 @@
 
 /* name for copybit_set_parameter */
 enum {
+    /* Default blit destination is offline buffer */
+    /* clients to set this to '1', if blitting to framebuffer */
+    /* and reset to '0', after calling blit/stretch */
+    COPYBIT_BLIT_TO_FRAMEBUFFER = 0,
     /* rotation of the source image in degrees (0 to 359) */
     COPYBIT_ROTATION_DEG    = 1,
     /* plane alpha value */