Codec related update for g729
Merge after the following changes:
https://dev.iopsys.eu/voice/libvoice-broadcom/-/merge_requests/5
voicemngr!9 (merged)
feed/openwrt-telephony!73 (merged)
Sync and modify the codec used for chan_voicemngr and voicemngr to avoid transcoding through Asterisk.
Edited by Wenpeng Song