Send Power-off notifications

If we update the state of the old servicestate and the new before calling done
nothing will get sent out (no change).  Instead, just put the new state
in the mNewSS and call done - it'll copy it to mSS and note the diff and
notify everyone.

bug:8304092
Change-Id: I5fee4805245c547175bbd8b0e18f407edfc8c3d8