RFC1144: integration and unit-test

The previously pushed slhc implementation has been modified to compile
and function outside of the kernel. Also debug log messages were added
and datatypes ware matched. The implementation is now ready to be used

Change-Id: I7a638e88a43b3eb9d006751a03ef2570e36613f0
diff --git a/openbsc/src/gprs/sgsn_main.c b/openbsc/src/gprs/sgsn_main.c
index 7d533c0..9f3260d 100644
--- a/openbsc/src/gprs/sgsn_main.c
+++ b/openbsc/src/gprs/sgsn_main.c
@@ -294,6 +294,11 @@
 		.description = "SCCP User Adaptation (SUA)",
 		.enabled = 1, .loglevel = LOGL_DEBUG,
 	},
+	[DSLHC] = {
+		.name = "DSLHC",
+		.description = "RFC1144 TCP/IP Header compression (SLHC)",
+		.enabled = 1, .loglevel = LOGL_DEBUG,
+	},
 };
 
 static const struct log_info gprs_log_info = {