Rename three header files to free namespace for api.

Change-Id: Ie9ef65a477373c30b2d5b02248f62e768b6f27ae
diff --git a/libs/rs/rsSampler.h b/libs/rs/rsSampler.h
index 654cd9c..013e4ca 100644
--- a/libs/rs/rsSampler.h
+++ b/libs/rs/rsSampler.h
@@ -18,7 +18,7 @@
 #define ANDROID_RS_SAMPLER_H
 
 #include "rsAllocation.h"
-#include "RenderScript.h"
+#include "rs.h"
 
 // ---------------------------------------------------------------------------
 namespace android {