gsm_data: Add gsm_bts_name() just like we have gsm_{trx,ts,lchan}_name()

Change-Id: Icd7fd6273396026c5fe2da600f35631b1bac1614
diff --git a/include/osmocom/bsc/gsm_data.h b/include/osmocom/bsc/gsm_data.h
index 9f7ce8d..9f2f816 100644
--- a/include/osmocom/bsc/gsm_data.h
+++ b/include/osmocom/bsc/gsm_data.h
@@ -1215,6 +1215,7 @@
 enum gsm_phys_chan_config gsm_pchan_parse(const char *name);
 const char *gsm_lchant_name(enum gsm_chan_t c);
 const char *gsm_chreq_name(enum gsm_chreq_reason_t c);
+char *gsm_bts_name(const struct gsm_bts *bts);
 char *gsm_trx_name(const struct gsm_bts_trx *trx);
 char *gsm_ts_name(const struct gsm_bts_trx_ts *ts);
 char *gsm_ts_and_pchan_name(const struct gsm_bts_trx_ts *ts);