Added logw warning for non-implemented multiplier register
Added logw warning for non-implemented multiplier register

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