BTS_Test_ASCI: Add first ASCI test to check NCH support

Send Notification command to start and stop notifying an ASCI call.
When it starts, it is expected that NCH is received. Also it is expected
that NCH is received again. When it stops, it is expected that NCH is
not received anymore.

Change-Id: I3727c471663b731117a264f60d2f1ba5fd16928e
Related: OS#4851
diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index 37d15b8..d893601 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -74,6 +74,7 @@
 import from TELNETasp_PortType all;
 import from BTS_Tests_LAPDm all;
 
+friend module BTS_Tests_ASCI;
 friend module BTS_Tests_SMSCB;
 friend module BTS_Tests_VAMOS;
 friend module BTS_Tests_virtphy;