More header untangling.

Change-Id: I090943775cbda8d9515cdb484957f6b05d5b1799
diff --git a/libs/rs/driver/rsdGL.cpp b/libs/rs/driver/rsdGL.cpp
index 63bf7cc..fae602c 100644
--- a/libs/rs/driver/rsdGL.cpp
+++ b/libs/rs/driver/rsdGL.cpp
@@ -37,6 +37,7 @@
 
 #include <malloc.h>
 #include "rsContext.h"
+#include "rsDevice.h"
 #include "rsdShaderCache.h"
 #include "rsdVertexArray.h"
 #include "rsdFrameBufferObj.h"