staging: comedi: me4000: cleanup me4000_probe()

Move the non pci probe related code out of the me4000_probe function
and back into the me4000_attach function in preparation of converting
this driver to the 'attach_pci' callback.

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>