Remove on/off information if the services cannot toggle service on/off

Bug: 148837311
Test: Manual test
Change-Id: I57e0ed33bebc41cde99008bb2ed014c63194c52a

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

@@ -98,6 +98,7 @@ final class AccessibilityUtil {
     /** Denotes the accessibility enabled status */
     @Retention(RetentionPolicy.SOURCE)
     public @interface State {
+        int UNKNOWN = -1;
         int OFF = 0;
         int ON = 1;
     }