Revert "Workaround for SystemUI graphical corruption"

This reverts commit c7896e4e6651310545d3ce1800356709f360558a.

Change-Id: I0155a6893b24e4be2f1e843a41647ac5067d0920
Update graphics configuration

* Disable triple buffering in surfaceflinger
* Disable libgralloc hacks
* Disable hwui layer cache (to fix SystemUI corruption)

Change-Id: Ie7b329ecad0e29f19dc32cfd4e9e0e9a459eec6f