GPIO code updated in -HEAD

[Adrian Chadd]

Hi,

I've just updated the atheros GPIO code to allow for GPIO pin
definitions. Please check out what I've done in AR91XX_BASE.hints and
TP-WN1043ND.hints.

Stefan, would you mind verifying this is enough to bring up the switch
device on your tplink unit, using just your switch device/api patches?

Thanks,


Adrian