Properly assign LOG_TAGs in OMXMaster.cpp and MediaScanner.cpp

Change-Id: I863651619f84b2b66e9a926ce1fef8ce6a53a42d
related-to-bug: 2639116
diff --git a/media/libmedia/MediaScanner.cpp b/media/libmedia/MediaScanner.cpp
index 843a8fd..6f581d3 100644
--- a/media/libmedia/MediaScanner.cpp
+++ b/media/libmedia/MediaScanner.cpp
@@ -14,6 +14,10 @@
  * limitations under the License.
  */
 
+//#define LOG_NDEBUG 0
+#define LOG_TAG "MediaScanner"
+#include <utils/Log.h>
+
 #include <media/mediascanner.h>
 
 #include <sys/stat.h>