add osmo_cgi_name()

This will be used by cell idenitifier list code, like upcoming neighbor_ident
VTY in osmo-bsc and regression tests.

Change-Id: Iebc5cdf61b697b1603900993fc265af3eca0cedf
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index 31717d5..a6ea47d 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -277,6 +277,8 @@
 osmo_plmn_name2;
 osmo_lai_name;
 osmo_rai_name;
+osmo_cgi_name;
+osmo_cgi_name2;
 osmo_mnc_from_str;
 osmo_mnc_cmp;
 osmo_plmn_cmp;