Changes

csd_v110: handle TCH/F14.4

Thanks to the work done by Mychaela (see the related Change-IDs), we
can finally implement handling of TCH/F14.4 (both T and NT modes) for
osmo-bts-trx and osmo-bts-virtual.

This channel mode is special in a way that it employs a different
rate adaptation function RAA' (defined in 3GPP TS 48.020 chapter 11),
which converts between E-TRAU frames (spoken over the air) and
A-TRAU frames (spoken over the A interface).

The result of function RAA' in the Uplink direction is 320 bits,
which is equal to 4 x 80-bit V.110 frames, but actually carrying
8 x 36-bit packed frames.  These 320 bits are then fed to the RA2
function, like we do for other CSD channel modes.

Change-Id: I3c3bef0bd2f72b8381597b5699e2060165b702a0
Depends: libosmo-abis.git I11fc1529f5be88fa778c7e05cb11eef58a389d40
Depends: libosmo-abis.git I1347a25ce97d5022502ee9112caded66315b09a4
Related: OS#6167