lights: Add a log tag

Change-Id: I7f4643324ed5c52b60ceede5f1ad8f24131cf3c0
diff --git a/liblights/lights_helper.c b/liblights/lights_helper.c
index 565101b..5fd8b12 100644
--- a/liblights/lights_helper.c
+++ b/liblights/lights_helper.c
@@ -14,6 +14,9 @@
  * limitations under the License.
  */
 
+#define LOG_TAG "SamsungLightsHelper"
+/* #define LOG_NDEBUG 0 */
+
 #include <errno.h>
 #include <fcntl.h>
 #include <stdlib.h>