Add OML Failure Event Report support

Add 3GPP TS 12.21 ยง 8.8.2 Failure Event Report function which pack given
vararg string and parameters into msgb.

Change-Id: I58c198d8ea588432c62520928b08f0b2a7035e93
Related: OS#1615
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index c876d2b..0c37d1c 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -4,6 +4,7 @@
 abis_nm_adm_state_names;
 abis_nm_att_settable;
 abis_nm_avail_name;
+abis_nm_fail_evt_rep;
 abis_nm_chcomb4pchan;
 abis_nm_debugp_foh;
 abis_nm_event_type_name;