gsm0808: Add AoIP specific elements to gsm0808_create_... functions

the classic A implementation in libosmocore lacks support for AoIP
message elements. This patch adds support for AoIP by adding a set
of new gsm0808_create_..., which support the missing AoIP message
elements

Change-Id: I77f866abec1822d19871052f3c647ad782785b34
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index c89cbe4..518a5aa 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -125,7 +125,9 @@
 gsm0808_bssap_name;
 gsm0808_bssmap_name;
 gsm0808_create_assignment_completed;
+gsm0808_create_ass_compl;
 gsm0808_create_assignment_failure;
+gsm0808_create_ass_fail;
 gsm0808_create_cipher_complete;
 gsm0808_create_cipher_reject;
 gsm0808_create_classmark_update;
@@ -134,6 +136,7 @@
 gsm0808_create_clear_rqst;
 gsm0808_create_dtap;
 gsm0808_create_layer3;
+gsm0808_create_layer3_aoip;
 gsm0808_create_reset;
 gsm0808_create_sapi_reject;
 gsm0808_prepend_dtap_header;