Refine DebugHelper.h into Log.h.

This removes USE_FUNC_LOGGER from libbcc-config.mk.
diff --git a/lib/RenderScript/RSInfoReader.cpp b/lib/RenderScript/RSInfoReader.cpp
index 4e42ffd..035209a 100644
--- a/lib/RenderScript/RSInfoReader.cpp
+++ b/lib/RenderScript/RSInfoReader.cpp
@@ -24,7 +24,7 @@
 
 #include <utils/FileMap.h>
 
-#include "bcc/Support/DebugHelper.h"
+#include "bcc/Support/Log.h"
 #include "bcc/Support/InputFile.h"
 
 using namespace bcc;