BSSMAP_Emulation: use BSSAP_CodecPort

So far, BSSMAP_Emulation used the SCCPasp_SP_PORT directly, explicitly
calling BSSAP encode/decode functions while processing the primitives.

Let's clean this up and use the BSSAP_CodecPort which has meanwhile
been developed as a dual-faced port that can be stacked between SCCPasp
and the user to avoid any manual encode/decode function calls.

Change-Id: Icded789d18f3469f74e16f552df2c7ac44ac4294
diff --git a/bsc-nat/MSC_ConnectionHandler.ttcn b/bsc-nat/MSC_ConnectionHandler.ttcn
index 3fc11e9..b038ce5 100644
--- a/bsc-nat/MSC_ConnectionHandler.ttcn
+++ b/bsc-nat/MSC_ConnectionHandler.ttcn
@@ -4,6 +4,7 @@
 import from Osmocom_Types all;
 import from SCCPasp_Types all;
 import from BSSAP_Types all;
+import from BSSAP_CodecPort all;
 import from BSSMAP_Emulation all;
 import from BSSMAP_Templates all;
 
@@ -26,7 +27,7 @@
 
 /* Callback function from general BSSMAP_Emulation whenever a new incoming
  * SCCP connection arrivces. Must create + start a new component */
-private function CreateCallback(ASP_SCCP_N_CONNECT_ind conn_ind, charstring id)
+private function CreateCallback(BSSAP_N_CONNECT_ind conn_ind, charstring id)
 runs on BSSMAP_Emulation_CT return BSSAP_ConnHdlr {
 	var MSC_ConnHdlr vc_conn;
 	/* Create a new BSSAP_ConnHdlr component */