Use new heap configuration for 1080p phones

Change-Id: Ie14d9d3b89fb0835d2de479029cf33a72028ff1e
Increase libhwui memory limits

More appropriate libhwui memory limits for our large screen, see
new values in frameworks/native/build/phone-xxhdpi-2048-hwui-memory.mk
versus defaults here:

http://source.android.com/devices/tuning.html

Change-Id: Ife095667b0a3e7e39b494470ffbbfea0b706e713