Squashed merge with cm-10.2

Summary:
Squashed of the following:

hwui: Update configuration for 2GB/1080p devices

Change-Id: I73357a35bee22d76d3fe8a98ece91c5c9d19371d

Revert "Rework BOARD_EGL_NEEDS_LEGACY_FB implementation"

This reverts commit 1c01d2b237a8bad651be594b8e67db6abd24c57f, it's
not reliable on Mali

libgui: Bring back support for mHeap-based screenshots

Older graphics libraries throw a hissy fit when trying to lock
buffers for Surface-based screenshots, on at least Tegra2/3 and
Exynos4 hardware.

This patch depends on the BOARD_EGL_NEEDS_LEGACY_FB board flag
and requires the ro.bq.gpu_to_cpu_unsupported property set to 1
in order to work

Change-Id: I7db955e2cdd120018e349c14290e975788e70ed3

hax: Split the exynos4/tegra legacy code paths

They hang up at different places, and require different fixes.
Tested on t3 and e4

Change-Id: I46257a7e9e6b6e093a5cb92eaaaef4bdd0435a12

Merge branch 'cm-10.2' of git://github.com/CyanogenMod/android_frameworks_native into jb-devel-mr2-release-update

Test Plan: win...LGTM

Reviewers: randall.rushing, synergy

Reviewed By: synergy

Differential Revision: http://review.codefirex.com/D332