staging: comedi: Kconfig: COMEDI_NI_ATMIO should select COMEDI_FC

As pointed out by the kbuild test robot, the ni_atmio driver includes
ni_mio_common.c which uses the helper functions in the comedi_fc module.

Select the COMEDI_FC module when COMEDI_NI_ATMIO is enabled to fix the
following build error:

ERROR: "cfc_write_array_to_buffer" [drivers/staging/comedi/drivers/ni_atmio.ko] undefined!
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/Kconfig

@@ -485,6 +485,7 @@ config COMEDI_NI_ATMIO
 	tristate "NI AT-MIO E series ISA-PNP card support"
 	select COMEDI_8255
 	select COMEDI_NI_TIO
+	select COMEDI_FC
 	---help---
 	  Enable support for National Instruments AT-MIO E series cards
 	  National Instruments AT-MIO-16E-1 (ni_atmio),