display: Add Support for Rec.2020

- Add Rec2020 CSC in qdMetadata for limited/full range
- Expose CSC as #defines in gralloc private header to
  help GFX decouple from the display headers

Change-Id: I90ee2708275bf1a37ece0fce2f0867dfad64e39a
Crs-fixed: 1074164
diff --git a/libgralloc/gralloc_priv.h b/libgralloc/gralloc_priv.h
index 4c059cf..738b63f 100644
--- a/libgralloc/gralloc_priv.h
+++ b/libgralloc/gralloc_priv.h
@@ -166,6 +166,13 @@
 #define HAL_IGC_NOT_SPECIFIED     0
 #define HAL_IGC_s_RGB             1
 
+/* Color Space: Values maps to ColorSpace_t in qdMetadata.h */
+#define HAL_CSC_ITU_R_601         0
+#define HAL_CSC_ITU_R_601_FR      1
+#define HAL_CSC_ITU_R_709         2
+#define HAL_CSC_ITU_R_2020        3
+#define HAL_CSC_ITU_R_2020_FR     4
+
 /* possible formats for 3D content*/
 enum {
     HAL_NO_3D                      = 0x0,