Enable multiusers support
Use 3GB dalvik heap and hwui memory (Originally 2GB)

Dependent on the following in frameworks/native
https://github.com/temasek/android_frameworks_native/commit/66d53076627c1c499b3874d5e63ae5e986854a59
Hlte-common: Enable home button wake overlay
Enable hardware keys enable/disable through overlay
hlte-common: Enable f2fs on /data & /cache