Update of accessibility settings

1. Removed the global toggle switch - now each accessibility
   feature has to be turned on or off separately.

2. Added a setting for the screen rotation (same as Dispaly)
   since most of blind users want that behavior.

bug:5166161
bug:5127475

Change-Id: I659aef62a8499461075f43520a3008fa7b8ff911
4 files changed