bebob: Add a workaround for changing sampling rate in M-Audio Firewire 1814

This device has a quirk. Just after command AV/C Plug Signal command for
output, AV/C Plug Signal command for input causes timeout or badly confict
error.

This workaround adds wait for 100 msec just after the former command. As
long as I know, the device finish requested operation and successfully
handle the latter command.