Adapt full_hammerhead.mk to use our binaries from 2nd preview

Since we don´t have the final binaries, we´ll use these ones coming
from second developer preview release since they are the newest ones.
Enable Ambient Display

This will make Ambient Display to appears on Settings and works on hammerhead.

Change-Id: I58a511b3bd0d6a5041240c22af5466f59211461c