ip.access: Keep a full copy of local and remote IP/PORT in lchan

Keeping all parameters for each RTP connection in the abis_ip member of
lchan will help us with actual TCH handover later on.
diff --git a/openbsc/include/openbsc/abis_rsl.h b/openbsc/include/openbsc/abis_rsl.h
index 6d0ab61..f0a5619 100644
--- a/openbsc/include/openbsc/abis_rsl.h
+++ b/openbsc/include/openbsc/abis_rsl.h
@@ -537,8 +537,7 @@
 /* ip.access specfic RSL extensions */
 int rsl_ipacc_crcx(struct gsm_lchan *lchan);
 int rsl_ipacc_mdcx(struct gsm_lchan *lchan, u_int32_t ip,
-		   u_int16_t port, u_int16_t conn_id,
-		   u_int8_t rtp_payload2);
+		   u_int16_t port, u_int8_t rtp_payload2);
 int rsl_ipacc_pdch_activate(struct gsm_lchan *lchan);
 
 int abis_rsl_rcvmsg(struct msgb *msg);