Clean up the main architecture of Contextual Settings Homepage.

- Add lifecycle observer in HomepageManager.
- Rename some variables.

Bug: 111676964
Test: robotests
Change-Id: Ic91c53f2c1622d602b3edc664a06a13aa6945f47

src/com/android/settings/homepage/HomepageCardController.java

@@ -16,11 +16,10 @@
 
 package com.android.settings.homepage;
 
-import com.android.settingslib.core.lifecycle.Lifecycle;
-
 import java.util.List;
 
 //TODO(b/111821137): add test cases
+
 /**
  * Data controller for {@link HomepageCard}.
  */
@@ -39,7 +38,5 @@ public interface HomepageCardController {
 
     void onActionClick(HomepageCard card);
 
-    void setLifecycle(Lifecycle lifecycle);
-
     void setHomepageCardUpdateListener(HomepageCardUpdateListener listener);
 }