intel2200BGFirmware: init at 3.1

This commit adds the firmware for the Intel 2200BG wireless cards for
the ipw2200 kernel module. Also it changes the
networking.enableIntel2200BGFirmware option to set it as
hardware.firmware since firmware-linux-nonfree does not contain the
appropiate firmware anymore. Also hardware.enableAllFirmware does enable
the intel2200BGFirmware now.