fireworks/bebob: use BIT() macro to make bit flag

Use BIT() macro in /include//linux/bitops.h
fireworks: change processing controls for digital interface

Echo's AudioFire, Mackie's Onyx F series has digital interface but Gibson's
don't have. The models Except for Gibson's have coaxial digital interface and
iec60958 format can be changed.

In previous implementation, the meaning of 3rd flag was wrong. See:
http://sourceforge.net/mailarchive/message.php?msg_id=31398992
fireworks: update some comments
fireworks: add my name to MODULE_AUTHOR