sdk: Rework reading mode API

* The current API makes no sense, and doesn't really
  fit with how the other boolean features work
* While we're at it, place AutoContrast properly

Change-Id: I81d7805411c281e435c7451c0b62689711dbb323

sdk/src/java/lineageos/hardware/ILineageHardwareService.aidl

@@ -65,6 +65,4 @@ interface ILineageHardwareService {
 
     TouchscreenGesture[] getTouchscreenGestures();
     boolean setTouchscreenGestureEnabled(in TouchscreenGesture gesture, boolean state);
-
-    boolean setGrayscale(boolean state);
 }

sdk/src/java/lineageos/hardware/LineageHardwareManager.java

@@ -160,12 +160,13 @@ public final class LineageHardwareManager {
 
     private static final List<Integer> BOOLEAN_FEATURES = Arrays.asList(
         FEATURE_ADAPTIVE_BACKLIGHT,
+        FEATURE_AUTO_CONTRAST,
         FEATURE_COLOR_ENHANCEMENT,
         FEATURE_HIGH_TOUCH_SENSITIVITY,
         FEATURE_KEY_DISABLE,
         FEATURE_SUNLIGHT_ENHANCEMENT,
         FEATURE_TOUCH_HOVERING,
-        FEATURE_AUTO_CONTRAST
+        FEATURE_READING_ENHANCEMENT
     );
 
     private static LineageHardwareManager sLineageHardwareManagerInstance;
@@ -874,19 +875,4 @@ public final class LineageHardwareManager {
         }
         return false;
     }
-
-    /**
-     * Enables or disables reading mode
-     *
-     * @return true if success
-     */
-    public boolean setGrayscale(boolean state) {
-        try {
-            if (checkService()) {
-                return sService.setGrayscale(state);
-            }
-        } catch (RemoteException e) {
-        }
-        return false;
-    }
 }