Prevent stock OTA activities from running in CM

Change-Id: I3f586cd246fc351afb82c94f41329bf930f6f41a

Conflicts:
	config/common.mk
otablock: also disable BroadcastReceiver

otherwise it'll prevent the device from going to sleep

Change-Id: I56e20c4b3e33c78f30e095f38240d6663c9d74f5