Add progressive disclsoure

- Add a ProgressiveDisclosureMixin that contains all logic for collapse
  preference list when it's too long
- Refactored PreferenceController's updateState to take a preference
  instead of PreferenceScreen, because with progressive disclosure the
  preference can either be in screen or the mixin. DashboardFragment is
  responsible finding the preference before passing it to controller.

Bug: 32255863
Test: RunSettingsRoboTests

Change-Id: I6713abd61c954ce12732902e5b3ca4d4c0b1563e

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

@@ -40,7 +40,7 @@ public class AdditionalSystemUpdatePreferenceController extends PreferenceContro
     }
 
     @Override
-    protected String getPreferenceKey() {
+    public String getPreferenceKey() {
         return KEY_UPDATE_SETTING;
     }
 }

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

@@ -33,7 +33,7 @@ public class ManageStoragePreferenceController extends PreferenceController {
     }
 
     @Override
-    protected String getPreferenceKey() {
+    public String getPreferenceKey() {
         return KEY_MANAGE_STORAGE;
     }
 

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

@@ -51,7 +51,7 @@ public class SystemUpdatePreferenceController extends PreferenceController {
     }
 
     @Override
-    protected String getPreferenceKey() {
+    public String getPreferenceKey() {
         return KEY_SYSTEM_UPDATE_SETTINGS;
     }