enable desertcase dream

WTF not?  code is already there.

Change-Id: I942af313ab804504a40eceac2c41e02f9ef3514b
BatteryService: privatize battery light observer

Change-Id: Ic7a7a03b028c3f9a09a02ca7acb169942af2a215
Merge changes Ic7a7a03b,I942af313 into kk44

* changes:
  BatteryService: privatize battery light observer
  enable desertcase dream