nrf51/dietemp: stub for soft-device support
nrf51/dietemp: stub for soft-device support

Reading the temperature can take up to 50us; the soft-device wants to be
in control during the delay.

(NB: Soft-device API coded but not tested; non-SD verified.)

pabigot/bspacm,pabigot/bspacm,pabigot/bspacm,pabigot/bspacm