TRAU: Properly initialize idle frames
TRAU: Properly initialize idle frames

This is particularly important in case of the Nokia BTS, as they seem
to drop the RF/signalling channel if they don't get proper TRAU
frames.

telenoobie/libosmo-abis,osmobuntu/libosmo-abis,osmocom/libosmo-abis,osmobuntu/libosmo-abis,telenoobie/libosmo-abis,osmobuntu/libosmo-abis,osmocom/libosmo-abis,osmocom/libosmo-abis,osmobuntu/libosmo-abis