snd-bebob: support some commands of bridgeCo extension of AV/C

To control BeBoB chipset, some bridgeCo extension is needed.
This commit add just needed commands to control streaming.

With this commit, Yamaha Go44 and Go46 can do stream in any sampling rates.
Currently its playback and capture are supported, MIDI is not supported.
But the streamings is not based on any synchronization.

This commit has a meaning of checking AMDTP non-blocking stream because
Fireworks driver apply AMDTP blocking stream.