osmux: Unify rtp_conn osmux type into a single type

There's no need to separate between BSS and CN side nowadays, the
different types are used nowehere. This separation dates from
osmo-bsc-nat code days.

Change-Id: I65effeddf033eb1955553e8d659c593b4e67f7bc
diff --git a/src/libosmo-mgcp/mgcp_network.c b/src/libosmo-mgcp/mgcp_network.c
index a3c245a..5246160 100644
--- a/src/libosmo-mgcp/mgcp_network.c
+++ b/src/libosmo-mgcp/mgcp_network.c
@@ -1013,10 +1013,9 @@
 			 "using mgcp_send() to forward data directly\n");
 		return mgcp_send(endp, proto == MGCP_PROTO_RTP,
 				 mc->from_addr, msg, conn_src, conn_dst);
-	case MGCP_OSMUX_BSC_NAT:
-	case MGCP_OSMUX_BSC:
+	case MGCP_RTP_OSMUX:
 		LOGPENDP(endp, DRTP, LOGL_DEBUG,
-			 "endpoint type is MGCP_OSMUX_BSC_NAT, "
+			 "endpoint type is MGCP_RTP_OSMUX, "
 			 "using osmux_xfrm_to_osmux() to forward data through OSMUX\n");
 		return osmux_xfrm_to_osmux((char*)msgb_data(msg), msgb_length(msg), conn_dst);
 	case MGCP_RTP_IUUP: