gsm: add gsm0808_speech_codec_type_names

Used for logging Speech Codec List entries in osmo-bsc, during handover
decision.

Change-Id: Ie6418d16db333188e9bcd2b32b7216f277ae8832
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index 5611ba3..985ec83 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -172,6 +172,7 @@
 gsm0808_dec_cell_id_list;
 gsm0808_chan_type_to_speech_codec;
 gsm0808_speech_codec_from_chan_type;
+gsm0808_speech_codec_type_names;
 
 gsm0858_rsl_ul_meas_enc;