log: Add new DLSTATS log level

This log level is used by the stats subsystem log reporter to report
statistics to level INFO. Note that the default level of DLSTATS is
NOTICE.

Sponsored-by: On-Waves ehf
diff --git a/src/logging.c b/src/logging.c
index 20b0596..876964a 100644
--- a/src/logging.c
+++ b/src/logging.c
@@ -117,6 +117,11 @@
 		.description = "GPRS GTP library",
 		.enabled = 1, .loglevel = LOGL_NOTICE,
 	},
+	[INT2IDX(DLSTATS)] = {
+		.name = "DLSTATS",
+		.description = "Statistics messages and logging",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
 };
 
 /*! \brief descriptive string for each log level */