Create DebugHelper.h

From now on, include DebugHelper.h for debug purpose.
diff --git a/lib/bcc/FileHandle.cpp b/lib/bcc/FileHandle.cpp
index 7dcb065..919cb48 100644
--- a/lib/bcc/FileHandle.cpp
+++ b/lib/bcc/FileHandle.cpp
@@ -14,11 +14,10 @@
  * limitations under the License.
  */
 
-#define LOG_TAG "bcc"
-#include <cutils/log.h>
-
 #include "FileHandle.h"
 
+#include "DebugHelper.h"
+
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/file.h>