add BSSMAP coding for Location Services

BSSMAP: add A-interface messages between MSC and BSC:
- Perform Location Request
- Perform Location Response
- Perform Location Abort

Change-Id: I4d7302a4853518916b6b425e710c10568eb2ffe5
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index 89d81b3..1fd212d 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -255,6 +255,9 @@
 gsm0808_dec_lcls;
 gsm0808_msgb_put_cell_id_u;
 gsm0808_decode_cell_id_u;
+gsm0808_create_perform_location_request;
+gsm0808_create_perform_location_response;
+gsm0808_create_perform_location_abort;
 
 gsm29118_msgb_alloc;
 gsm29118_create_alert_req;