LCLS: add gsm0808_create_ass2()

It allows setting additional assignment parameters explicitly.

Change-Id: Id89765df3f8c12f55f73f1d7a9d90c8883eb3bba
Related: OS#2487
diff --git a/tests/gsm0808/gsm0808_test.ok b/tests/gsm0808/gsm0808_test.ok
index d5857e3..8e6d262 100644
--- a/tests/gsm0808/gsm0808_test.ok
+++ b/tests/gsm0808/gsm0808_test.ok
@@ -14,6 +14,7 @@
 Testing creating CM U
 Testing creating SAPI Reject
 Testing creating Assignment Request
+Testing creating Assignment Request with Kc and LCLS
 Testing creating Assignment Complete
 Testing creating Assignment Complete (AoIP)
 Testing creating Assignment Failure