Add LOG_TAGs to drm hal default modules

Change-Id: I1267205999b7cc660a6c908f0d183e43277a9c71
diff --git a/drm/1.0/default/DrmFactory.cpp b/drm/1.0/default/DrmFactory.cpp
index cba2c99..b6f642f 100644
--- a/drm/1.0/default/DrmFactory.cpp
+++ b/drm/1.0/default/DrmFactory.cpp
@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+#define LOG_TAG "android.hardware.drm@1.0-impl"
 
 #include "DrmFactory.h"
 #include "DrmPlugin.h"