staging: comedi: Kconfig: COMEDI_S526 is a PC/104 board not a PCI board

The Sensoray Model 526 board is a PC/104 style board not a PCI board.
Move it into the correct group in the Kconfig and Makefile.

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>