staging: comedi: addi_apci_3120: introduce apci3120_timer_read()

Introduce a helper function to select a timer and read a value from it.

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