staging: comedi: addi_apci_1032: simplify the PCI bar reading

This board has a 93c76 eeprom. Knowing this information allows
simplifying the code that reads the PCI bars to get the iobase
addresses used in the driver.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>