Create DebugHelper.h

From now on, include DebugHelper.h for debug purpose.
diff --git a/lib/bcc/CacheWriter.cpp b/lib/bcc/CacheWriter.cpp
index b0971ba..67def9b 100644
--- a/lib/bcc/CacheWriter.cpp
+++ b/lib/bcc/CacheWriter.cpp
@@ -14,12 +14,10 @@
  * limitations under the License.
  */
 
-#define LOG_TAG "bcc"
-#include <cutils/log.h>
-
 #include "CacheWriter.h"
 
 #include "ContextManager.h"
+#include "DebugHelper.h"
 #include "FileHandle.h"
 #include "Script.h"