move some gsm48 utility functions to libosmocore

* gsm48_generate_lai() gsm48_generate_mid_from_tmsi() gsm48_generate_mid_from_imsi()
* gsm48_cc_msg_names[]
diff --git a/openbsc/src/system_information.c b/openbsc/src/system_information.c
index 36dc6b9..a9df0ba 100644
--- a/openbsc/src/system_information.c
+++ b/openbsc/src/system_information.c
@@ -287,9 +287,9 @@
 	si3->header.system_information = GSM48_MT_RR_SYSINFO_3;
 
 	si3->cell_identity = htons(bts->cell_identity);
-	gsm0408_generate_lai(&si3->lai, bts->network->country_code,
-			     bts->network->network_code,
-			     bts->location_area_code);
+	gsm48_generate_lai(&si3->lai, bts->network->country_code,
+			   bts->network->network_code,
+			   bts->location_area_code);
 	si3->control_channel_desc = bts->si_common.chan_desc;
 	si3->cell_options = bts->si_common.cell_options;
 	si3->cell_sel_par = bts->si_common.cell_sel_par;
@@ -319,9 +319,9 @@
 	si4->header.skip_indicator = 0;
 	si4->header.system_information = GSM48_MT_RR_SYSINFO_4;
 
-	gsm0408_generate_lai(&si4->lai, bts->network->country_code,
-			     bts->network->network_code,
-			     bts->location_area_code);
+	gsm48_generate_lai(&si4->lai, bts->network->country_code,
+			   bts->network->network_code,
+			   bts->location_area_code);
 	si4->cell_sel_par = bts->si_common.cell_sel_par;
 	si4->rach_control = bts->si_common.rach_control;
 
@@ -384,9 +384,9 @@
 	si6->skip_indicator = 0;
 	si6->system_information = GSM48_MT_RR_SYSINFO_6;
 	si6->cell_identity = htons(bts->cell_identity);
-	gsm0408_generate_lai(&si6->lai, bts->network->country_code,
-			     bts->network->network_code,
-			     bts->location_area_code);
+	gsm48_generate_lai(&si6->lai, bts->network->country_code,
+			   bts->network->network_code,
+			   bts->location_area_code);
 	si6->cell_options = bts->si_common.cell_options;
 	si6->ncc_permitted = bts->si_common.ncc_permitted;