egprs: Add CPS tables from TS 04.60

Includes EGPRS coding and puncturing scheme (CPS) tables from 3GPP
TS 04.60. Currently osmo-bts-trx is the only user of CPS table
values, but this may change with gprsdecode and other utilities.

Change-Id: I09fe6514a0e2e51bb3206f8387633f7e0255345f
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index 9667ea0..f530b6f 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -48,6 +48,8 @@
 gprs_ms_net_cap_gea_supported;
 gprs_msgt_gmm_names;
 
+egprs_get_cps;
+
 gsm48_gmm_cause_names;
 gsm48_gsm_cause_names;
 gprs_att_t_strs;