add option to force high-end graphics on low memory devices

Change-Id: I34e0d7381615485b58385abed743e01f7272772d
Revert "add option to force high-end graphics on low memory devices"

This reverts commit ae175cfe7f198d544b424a9e43cf21c97be93e44.
Merge commit '888e103' into HEAD
Kill CM performance_settings some more

Change-Id: I4924a84f21c44b7e69ee2a363d55c40234394b54