staging: comedi: das_08: remove the 8254 'logic2phys' usage

The three 8254 timers have a 1:1 relationship to the comedi
channels. The 'logic2phys' usage just makes the driver more
complex.

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>