native: Restore VM memory overrides

This change adds back the property overrides for several device
types as we had in CM 11.

It contains a squished commit of the following:

commit 5b9240927f8af0b26c406835df33b2d999496434
Author: Steve Kondik <shade@chemlab.org>
Date:   Thu Nov 6 14:40:44 2014 -0800

    Add hdpi-2048 tunings

commit ed579d8be17fb52ef92a1dc9c83843879f396fa1
Author: Steve Kondik <shade@chemlab.org>
Date:   Sat Jan 4 12:12:00 2014 -0800

    Update HWUI config for xxhdpi/2GB devices

commit 386f220e174f9ed5aad487867223033fd5d986c6
Author: Steve Kondik <shade@chemlab.org>
Date:   Tue Aug 6 02:53:19 2013 -0700

    hwui: Update configuration for 2GB/1080p devices

commit b7392d113d8ae6c3c07990bbb3f2621bef490d11
Author: Steve Kondik <shade@chemlab.org>
Date:   Sat Jun 1 14:51:17 2013 +0200

    provide overrides for hwui memory limits for xxhdpi phones

commit 247b3c635b1d6776ffedf3cd61a936546c2f6603
Author: Steve Kondik <shade@chemlab.org>
Date:   Fri May 17 13:10:19 2013 -0700

    Add heap configuration for 1080p phones with 2048m

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

commit 9856e93970fd6def1349e564f17d42f505904eba
Author: Andrew Bartholomew <andrewb03@gmail.com>
Date:   Thu Apr 25 13:48:21 2013 -0400

    build/phone-xhdpi-1024-dalvik-heap.mk Revert AOSP heapgrowthlimit change from 64 to 96

    This reverts part of AOSP change at

    https://android.googlesource.com/platform/frameworks/native/+/c84e9844d621223d14178be521

    Possible performance issues have arisen because of it. Discussion at

    http://code.google.com/p/android/issues/detail?id=40961

    Patch Set 2: Clean up commit message

commit bd7fb4be323f6f868a886b22e93cf203944af9a6
Author: Bhargav Upperla <bhargavuln@codeaurora.org>
Date:   Thu May 23 12:50:15 2013 -0700

    Configure dalvik heap parameters for low memory devices

    Reduces after boot memory footprint by about 5-8MB
    Note: This is for low memory based devices only (~512MB RAM
    or less)

Change-Id: Id7e1967d18227359ad9631139bfd47e61e494829
Merge pull request #1 from CyanogenMod/cm-12.0

native: Restore VM memory overrides