staging: comedi: adl_pci9111: cleanup timer_divisor_[12]

For aesthetic reasons, rename the symbols.

Remove the unnecessary () around the symbols in the calls to
i8253_cascade_ns_to_timer_2div().

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>