Add 3GB dalvik heap and hwui memory

Should be used on devices with 3gb's of ram (Bacon, LG G3, etc)
Change-Id: I5833a19ea77b99009fc9f9c7c2a967b0dde06b77

Patchset: 2
http://review.cyanogenmod.org/#/c/74395/

(cherry picked from commit 2e86db80715ca76bbed7e1bc29f544502ea8c6a0)
(2/3) allow to configure lcd density

Change-Id: I8366d29027f3ac75f61ae727bd865dceede42c06

(cherry picked from commit e17c6034a6f5baf978fa9936eb915f51ddce53e6)