Revert "Add forceHighEndGfx property to override isHighEndGfx"

This reverts commit b186a2b89507fc28e7efa83a36c5fd8af16620a7.
Revert "Missing ActivityManager for HighEndGfx"

This reverts commit a69ba56cacb65a695c4ea3389c5a5d272d3cf09d.
Enable HighEndGfx fix