staging: comedi: addi_apci_16xx: remove unnecessary comments

A lot of the comments in hwdrv_apci16xx.c have whitespace damage and
are simply unnecessary. Just remove them to make the code a bit more
readable.

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>