goldfish: fix gralloc module

Explicitly setting reserved (in C++) breaks future extensions of the
module format.  Removed these explicit settings for future
compatibility.

Change-Id: Iaacd5c2f55121bcb8f1761f646ace374eceb2b4f
diff --git a/opengl/system/gralloc/gralloc.cpp b/opengl/system/gralloc/gralloc.cpp
index ac20d49..311146f 100644
--- a/opengl/system/gralloc/gralloc.cpp
+++ b/opengl/system/gralloc/gralloc.cpp
@@ -894,8 +894,7 @@
         unregisterBuffer: gralloc_unregister_buffer,
         lock: gralloc_lock,
         unlock: gralloc_unlock,
-        perform: NULL,
-        reserved_proc : {NULL, }
+        perform: NULL
     }
 };