staging: comedi: Make COMEDI_FC a hidden Kconfig option

The COMEDI_FC Kconfig option is selected by the relevant drivers
when needed. Since it only contains shared functions, selecting
it manually serves no purpose. Just make it a hidden selection.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/Kconfig

@@ -1305,15 +1305,8 @@ config COMEDI_8255
 	  called 8255.
 
 config COMEDI_FC
-	tristate "Comedi shared functions for low-level driver support"
+	tristate
 	depends on COMEDI
-	---help---
-	  Enable support for shared functions for low-level drivers.
-	  This module is not used directly by end-users. Rather, it
-	  is used by many other comedi drivers.
-
-	  To compile this driver as a module, choose M here: the module will be
-	  called comedi_fc.
 
 config COMEDI_AMPLC_DIO200
 	tristate