Forward compatibility

Change-Id: I51a5eb98fb3fa3e09f2eb75de128068572081046
diff --git a/include/system/graphics.h b/include/system/graphics.h
index 729e92c..d42a0d3 100644
--- a/include/system/graphics.h
+++ b/include/system/graphics.h
@@ -86,7 +86,8 @@
      */
     HAL_PIXEL_FORMAT_YV12   = 0x32315659, // YCrCb 4:2:0 Planar
 
-
+    /* Forward compatibility */
+    HAL_PIXEL_FORMAT_RAW_SENSOR = 0x20,
 
     /* Legacy formats (deprecated), used by ImageFormat.java */
     HAL_PIXEL_FORMAT_YCbCr_422_SP       = 0x10, // NV16