staging: comedi: addi_common: remove the extra cruft

The individual addi-data files all define ADDIDATA_DRIVER_NAME. Remove
the #ifndef/#define for it in addi_common.c.

Remove the commented out MODULE_* stuff. The individual addi-data drivers
have this information.

Remove the, badly formatted, function comments. The functions are
obvious.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>