Fix build

Bug: 24107771
Test: compiles
Change-Id: I287cbe05a86de24d0817bd84e7db5b1893ef7d9b

src/com/android/settings/deviceinfo/BuildNumberPreferenceController.java

@@ -83,7 +83,7 @@ public class BuildNumberPreferenceController extends PreferenceController
     }
 
     @Override
-    protected boolean isAvailable() {
+    public boolean isAvailable() {
         return true;
     }