gprs_bssgp: add IE parser/generator for RIM Routing Information

The RIM Routing Information IE (see also 3GPP TS 48.018, section
11.3.70) is used to control the flow of BSSGP rim messages at the SGSN.

Change-Id: I6f88a9aeeb50a612d32e9efd23040c9740bc4f11
Related: SYS#5103
diff --git a/src/gb/libosmogb.map b/src/gb/libosmogb.map
index 59405b0..8f638ff 100644
--- a/src/gb/libosmogb.map
+++ b/src/gb/libosmogb.map
@@ -2,6 +2,7 @@
 global:
 bssgp_cause_str;
 bssgp_create_cell_id;
+bssgp_create_rim_ri;
 bssgp_pdu_str;
 bssgp_fc_in;
 bssgp_fc_init;
@@ -13,6 +14,7 @@
 bssgp_msgb_tlli_put;
 bssgp_msgb_ra_put;
 bssgp_parse_cell_id;
+bssgp_parse_rim_ri;
 bssgp_set_bssgp_callback;
 bssgp_tx_bvc_block;
 bssgp_tx_bvc_reset;