cosmetic: rename sccp_rx_udt and sccp_rx_dt to a_*

These rx functions are only used for the A interface, hence the names should
not suggest general SCCP rx (which Iu also has).

Change-Id: I6815c3d4dea4c2abfdff1cf0239ada6a9254f351
diff --git a/src/libmsc/a_iface_bssap.c b/src/libmsc/a_iface_bssap.c
index 8a1e39b..909a9f9 100644
--- a/src/libmsc/a_iface_bssap.c
+++ b/src/libmsc/a_iface_bssap.c
@@ -175,7 +175,7 @@
 }
 
 /* Receive incoming connection less data messages via sccp */
-void sccp_rx_udt(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg)
+void a_sccp_rx_udt(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg)
 {
 	/* Note: The only valid message type that can be received
 	 * via UNITDATA are BSS Management messages */
@@ -690,7 +690,7 @@
 }
 
 /* Handle incoming connection oriented messages */
-int sccp_rx_dt(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg)
+int a_sccp_rx_dt(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg)
 {
 	OSMO_ASSERT(scu);
 	OSMO_ASSERT(a_conn_info);