gralloc: Add ITU-R standard info for YUV formats

These format qualifiers will help graphics decide which
standard to use when working with a YUV texture.

Change-Id: I6ad464e6b070d3b375c5e07f03228308d15407cd
diff --git a/libgralloc/gralloc_priv.h b/libgralloc/gralloc_priv.h
index 511e81f..08d95be 100644
--- a/libgralloc/gralloc_priv.h
+++ b/libgralloc/gralloc_priv.h
@@ -159,6 +159,9 @@
             PRIV_FLAGS_CAMERA_READ        = 0x00040000,
             PRIV_FLAGS_HW_COMPOSER        = 0x00080000,
             PRIV_FLAGS_HW_TEXTURE         = 0x00100000,
+            PRIV_FLAGS_ITU_R_601          = 0x00200000,
+            PRIV_FLAGS_ITU_R_601_FR       = 0x00400000,
+            PRIV_FLAGS_ITU_R_709          = 0x00800000,
         };
 
         // file-descriptors