Make compatible with latest asterisk-trunk (new channel bridging code) (FYI: there is an issue with retrieving channel_bridge_peer at this moment, which may/will cause issues during transfer/conference/pickup, this needs some more investigation)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4655 43c1dc8c-776e-4df2-8ef1-6e829299be21