Settings: Allow disabling color inversion support [2/2]

Via an overlay
Some kernels won't support that no more

Change-Id: I4f63f36a0134aa612609fe6e574046e01baf1df3

src/com/android/settings/accessibility/ColorInversionPreferenceController.java

@@ -43,7 +43,9 @@ public class ColorInversionPreferenceController extends BasePreferenceController
 
     @Override
     public int getAvailabilityStatus() {
-        return AVAILABLE;
+        final boolean available = mContext.getResources().getBoolean(
+                com.android.internal.R.bool.config_displayInversionAvailable);
+        return available ? AVAILABLE : UNSUPPORTED_ON_DEVICE;
     }
 }
 // LINT.ThenChange(/src/com/android/settings/accessibility/ColorInversionPreference.kt)