LockClock: remove unused BroadcastReceiver

The reciver manifest tag was mispelled, so the
receiver never worked either way. The content provider
properly triggers an udpate so this class is not needed.

Change-Id: I113cc3fe5461475e365df9b5b3f8d70cae594e84
Signed-off-by: Roman Birg <roman@cyngn.com>