Removed VoidGPIO
Removed VoidGPIO

contiki-os/mspsim,joakimeriksson/mspsim,cmorty/mspsim,cmorty/mspsim,mspsim/mspsim,nfi/mspsim,fvdnabee/mspsim,nfi/mspsim,mspsim/mspsim,fvdnabee/mspsim,ransford/mspsim,joakimeriksson/mspsim,contiki-os/mspsim,ransford/mspsim