Add support for YUV allocations.

Change-Id: I21a47c745a2f8435af4f37ec0ad624002f3db555
diff --git a/rs.spec b/rs.spec
index 5802a0c..52950a2 100644
--- a/rs.spec
+++ b/rs.spec
@@ -34,6 +34,7 @@
     param uint32_t dimZ
     param bool mips
     param bool faces
+    param uint32_t yuv
     ret RsType
 }