CBSP (Cell Broadcast Service Protocol; 3GPP TS 48.049) support

This introduces definitions as well as a parser+encoder for the
Cell Broadcast Service Protocol (CBSP) as specified in 3GPP TS 48.049.

CBSP is used on the interface between CBC and BSC.

Related: OS#3537
Change-Id: I5b7ae08f67e415967b60ac4b824db9e22ca00935
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index 34a1543..eefcf61 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -646,5 +646,16 @@
 osmo_gsm48_classmark_a5_name_c;
 osmo_gsm48_classmark_update;
 
+cbsp_msg_type_names;
+cbsp_iei_names;
+cbsp_category_names;
+cbsp_att_tlvdef;
+osmo_cbsp_msgb_alloc;
+osmo_cbsp_decoded_alloc;
+osmo_cbsp_init_struct;
+osmo_cbsp_encode;
+osmo_cbsp_decode;
+osmo_cbsp_recv_buffered;
+
 local: *;
 };