bebob: remove 32.0kHz support from FW1814/ProjectMix

According to their manual, 32.0kHz is not supported.
bebob: fix wrong channel parameters for Firewire 1814/ProjectMix

It was wrong...
bebob: improve booting processing

In previous, sound card structure was created before checking whether to
load firmware or not. But this is a loss.
bebob: modify strings for proc output