Convert encryption status to preference controller

- Move Crypt/Encryption setting into security package.
- Reformat crypt_keeper_settings.xml
- Add controller and test for encryption status

Bug: 32953042
Test: robotests
Change-Id: I1f4b2f97133435c70a49522a59886ac4da6759af

tests/robotests/src/com/android/settings/widget/PreferenceCategoryControllerTest.java

@@ -37,17 +37,17 @@ import java.util.List;
 
 @RunWith(SettingsRobolectricTestRunner.class)
 @Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
-public class WorkOnlyCategoryPreferenceControllerTest {
+public class PreferenceCategoryControllerTest {
 
     private Context mContext;
-    private WorkOnlyCategoryPreferenceController mController;
+    private PreferenceCategoryController mController;
     private List<AbstractPreferenceController> mChildren;
 
     @Before
     public void setUp() {
         mContext = RuntimeEnvironment.application;
         mChildren = new ArrayList<>();
-        mController = new WorkOnlyCategoryPreferenceController(mContext, "pref_key", mChildren);
+        mController = new PreferenceCategoryController(mContext, "pref_key", mChildren);
     }
 
     @Test