drivers that implemnt the i2c bit banging bus interface not have to
recompile iicbb in order to add an attachment for it.
This will mean the bktr and other definitions can go back to their
respective drivers.
devices dynamically. That means,
+ only one /dev/iic or /dev/smb device for each smb/iic bus to access
+ I2C/SMB device address must be given to any ioctl
+ new devices may be plugged and accessed after boot, which was
impossible previously (device addresses were hardcoded into
the kernel)
