staging: comedi: addi_apci_3501: board does not have analog inputs

The board supported by this driver does not have analog inputs. Remove
the subdevice init for it.

Since the devpriv->s_EeParameters for the analog input subdevice are
not used, remove the initialization of them also.

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>