Remove all public mention of RS graphics from docs.

Change-Id: Ie43b5fb0353149aa9af433b6f5c5141349388ea0
diff --git a/graphics/java/android/renderscript/ProgramRaster.java b/graphics/java/android/renderscript/ProgramRaster.java
index c44521b..216cb4e 100644
--- a/graphics/java/android/renderscript/ProgramRaster.java
+++ b/graphics/java/android/renderscript/ProgramRaster.java
@@ -21,6 +21,7 @@
 
 
 /**
+ * @hide
  * @deprecated in API 16
  * Program raster is primarily used to specify whether point sprites are enabled and to control
  * the culling mode. By default, back faces are culled.