Start deep link page synchronously in SettingsActivity

- Use a synchronous API to make SettingsActivity start deep link intent
  in onCreate
- Change SettingsHomepageActivity from an alias to a real activity
- Clean up redundant codes

Fix: 206585572
Test: Manual, robotest build pass
Change-Id: Idf42c026f593bb5801a13cae250d1523030b7092

src/com/android/settings/core/SettingsBaseActivity.java

@@ -74,6 +74,9 @@ public class SettingsBaseActivity extends FragmentActivity implements CategoryHa
     @Override
     protected void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        if (isFinishing()) {
+            return;
+        }
         if (isLockTaskModePinned() && !isSettingsRunOnTop()) {
             Log.w(TAG, "Devices lock task mode pinned.");
             finish();