Gb: add a second NS implementation

Reimplement NS with FSM.

Change-Id: I3525beef205588dfab9d3880a34115f1a2676e48
diff --git a/src/logging.c b/src/logging.c
index af64541..212b0b9 100644
--- a/src/logging.c
+++ b/src/logging.c
@@ -230,6 +230,11 @@
 		.description = "Remote SIM protocol",
 		.enabled = 1, .loglevel = LOGL_NOTICE,
 	},
+	[INT2IDX(DLNS)] = {
+		.name = "DLNS",
+		.description = "GPRS NS layer",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
 };
 
 void assert_loginfo(const char *src)