Changes

HRv1 codec: add support for TW-TS-002

OsmoBTS supports TW-TS-001 enhanced RTP format for FR and EFR codecs
since 2024, providing functional equivalent of GSM 08.60 TRAU-UL
output over IP physical transport.  Now do the same with TW-TS-002,
IP equivalent of GSM 08.61 for HRv1 codec.

Only TCH UL path is affected; no changes are needed to TCH DL path
because existing RTP Rx handling for RFC 5993 also covers TW-TS-002.

Related: OS#6036
Change-Id: Icf11e43d4ce9df990d0e0a856d62d9ea11cb837c