Add heap configuration for 1080p phones with 2048m

 * Increase heap start size to 16m to minimize GC with larger bitmaps

Change-Id: I8fbba2e5a2a2cf2d7a6898ca6bae8639d6cf5a19
Merge branch 'cm-10.1' of https://github.com/CyanogenMod/android_frameworks_native.git into jb-mr1