Accessibility no longer overrides strong encryption (Settings).

Updating the accessibility layer behavior to reflect the new
model where accessibility no longer overrides strong encryption.
Now enabling an accessibility service lowers the encryption
level but the user can bump it up in settings if desired.

bug:17881324

Change-Id: Iaf46cbabf1c19c193ea39b35add27aaa4ff509e4

src/com/android/settings/ChooseLockGeneric.java

@@ -331,6 +331,10 @@ public class ChooseLockGeneric extends SettingsActivity {
         }
 
         private void updatePreferenceSummaryIfNeeded() {
+            if (LockPatternUtils.isDeviceEncrypted()) {
+                return;
+            }
+
             if (AccessibilityManager.getInstance(getActivity()).getEnabledAccessibilityServiceList(
                     AccessibilityServiceInfo.FEEDBACK_ALL_MASK).isEmpty()) {
                 return;