Refactor setCurrentFunction and setUsbDataUnlocked into one method

This allows us to get rid of an extraneous config switch and
simplify some code.

Test: Manually change usb configuration
Change-Id: Id78da530ff485ecd7a915056832eec1dd8c91954
(cherry picked from commit 5d36a177d9)

src/com/android/settings/DevelopmentSettings.java

@@ -1704,11 +1704,10 @@ public class DevelopmentSettings extends RestrictedSettingsFragment
     private void writeUsbConfigurationOption(Object newValue) {
         UsbManager manager = (UsbManager)getActivity().getSystemService(Context.USB_SERVICE);
         String function = newValue.toString();
-        manager.setCurrentFunction(function);
         if (function.equals("none")) {
-            manager.setUsbDataUnlocked(false);
+            manager.setCurrentFunction(function, false);
         } else {
-            manager.setUsbDataUnlocked(true);
+            manager.setCurrentFunction(function, true);
         }
     }