abis_nm: Introduce abis_nm_dump_foh()

This is a more modern way of printing the Abis OML Formatted Object
Header, without assuming that it would be used in a log statement
or prescribing the log level to be used.

Change-Id: I9b2c2afec28882b817d104d5b062651ade7aadd8
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index 36a7712..fd07704 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -8,6 +8,7 @@
 abis_nm_fail_evt_vrep;
 abis_nm_chcomb4pchan;
 abis_nm_debugp_foh;
+abis_nm_dump_foh;
 abis_nm_event_type_name;
 abis_nm_nack_cause_name;
 abis_nm_nack_name;