Add LOG_TAGs to drm hal default modules

Change-Id: I1267205999b7cc660a6c908f0d183e43277a9c71
diff --git a/drm/1.0/default/DrmPlugin.cpp b/drm/1.0/default/DrmPlugin.cpp
index 9204fc5..1b2f90e 100644
--- a/drm/1.0/default/DrmPlugin.cpp
+++ b/drm/1.0/default/DrmPlugin.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 <utils/KeyedVector.h>
 #include <utils/String8.h>