mgcp_client: add new clearmode codec

Set 120 as payload type, as specified in 3GPP TS 48.103 table 5.4.2.2.1.

Related: OS#4395
Related: https://www.rfc-editor.org/rfc/rfc4040#section-5
Change-Id: I55f9fe241a405935dbedc3947b0a4f4986acd5cb
2 files changed