staging: comedi: ni_660x: tidy up ni_660x_set_pfi_routing()

Use the comedi.h provided constants (enum ni_660x_pfi_routing) instead
of defining new ones for the output sources.

Use a switch to clarify the channel/source validation.

For aesthetics, rename the private data members 'pfi_output_selects' and
'pfi_direction_bits'.

Remove the 'min_counter_pfi_chan' and 'max_dio_pfi_chan' from
enum ni_660x_constants. The open coded values make the code easier
to follow.

Signed-off-by: H Hartley Sweeten <[email protected]>
Reviewed-by: Ian Abbott <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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