gprs_bssgp_rim: cosmetic: connect routing identifier strings with "-"

The bssgp_rim_routing_info_discr_strs string list contains whitespaces,
when the whitespaces are replaced with a "-" the log output looks better

Change-Id: I26facd3dc160603da89dcd787cccf78b19a20f02
Related: SYS#5103
diff --git a/src/gb/gprs_bssgp_rim.c b/src/gb/gprs_bssgp_rim.c
index 15d6e22..25f9406 100644
--- a/src/gb/gprs_bssgp_rim.c
+++ b/src/gb/gprs_bssgp_rim.c
@@ -42,9 +42,9 @@
 #define REP_CELL_ID_LEN 8
 
 const struct value_string bssgp_rim_routing_info_discr_strs[] = {
-	{ BSSGP_RIM_ROUTING_INFO_GERAN,		"GERAN cell" },
-	{ BSSGP_RIM_ROUTING_INFO_UTRAN,		"UTRAN RNC" },
-	{ BSSGP_RIM_ROUTING_INFO_EUTRAN,	"E-UTRAN eNodeB/HeNB" },
+	{ BSSGP_RIM_ROUTING_INFO_GERAN,		"GERAN-cell" },
+	{ BSSGP_RIM_ROUTING_INFO_UTRAN,		"UTRAN-RNC" },
+	{ BSSGP_RIM_ROUTING_INFO_EUTRAN,	"E-UTRAN-eNodeB/HeNB" },
 	{ 0, NULL }
 };