Reduce Davlik vm settings a bit

Acting like we have 2G of RAM turned out to be slow at times, but 7" 1G tablet
settings are too little and frequently result in allocation failures.
So let's try some middle ground.

Change-Id: Id2dd61c46822c20127aae28ac3a15c045d437556
Merge "Reduce Davlik vm settings a bit" into cm-10.1