mgcp: use codec information returned with ASSIGNMENT COMPL.

When the assignment completes a choosen codec is returned. At the
moment we do not use this information.

- add struct members for codec info (both, RAN and CN)
- parse codec info in BSSMAP ASSIGNMENT COMPLETE
- use codec info on mgcp

Since the MNCC API is not complete yet, we currently only use the
codec info only on the internal MNCC yet.

Change-Id: I9d5b1cd016d9a058b22a367d0e5e9f2ef447931a
Related: OS#2728
4 files changed