add rsl_or_ipac_msg_name() for both standard and ip.access msg types

Context: in osmo-bts, I want to look up an RSL message name in rsl_msgt_names
and fall back to rsl_ipac_msgt_names if not found, because the IPAC PDCH ACT
and DEACT messages are sent in a standard ABIS_RSL_MDISC_DED_CHAN.

Change-Id: Ic9ba721a1469cf51aed97ab0f44a7fe055c94b1f
Reviewed-on: https://gerrit.osmocom.org/231
Reviewed-by: Harald Welte <laforge@gnumonks.org>
Tested-by: Jenkins Builder
diff --git a/include/osmocom/gsm/rsl.h b/include/osmocom/gsm/rsl.h
index 418e3f0..b140d48 100644
--- a/include/osmocom/gsm/rsl.h
+++ b/include/osmocom/gsm/rsl.h
@@ -39,6 +39,7 @@
 const char *rsl_rlm_cause_name(uint8_t err);
 const char *rsl_msg_name(uint8_t err);
 const char *rsl_ipac_msg_name(uint8_t msg_type);
+const char *rsl_or_ipac_msg_name(uint8_t msg_type);
 
 /* Section 3.3.2.3 TS 05.02. I think this looks like a table */
 int rsl_ccch_conf_to_bs_cc_chans(int ccch_conf);