ASS-COMPL: do not fire Sec Mode Compl event

BSSMAP Assignment Complete:
Do not invoke ran_conn_rx_sec_mode_compl(), that's just weird.

Instead this should call msc_assign_compl(), which is currently dead code and
does nothing ... and there are some more strings attached, being resolved in a
subsequent patch.

Change-Id: I448fdb783364628005437b3d866d1a076a9767d7
diff --git a/src/libmsc/a_iface_bssap.c b/src/libmsc/a_iface_bssap.c
index a10bd42..d84a234 100644
--- a/src/libmsc/a_iface_bssap.c
+++ b/src/libmsc/a_iface_bssap.c
@@ -579,10 +579,6 @@
 		return -EINVAL;
 	}
 
-	/* FIXME: Seems to be related to authentication or,
-	   encryption. Is this really in the right place? */
-	ran_conn_rx_sec_mode_compl(conn);
-
 	return 0;
 }