Migrate the homepage fragment to use preferences and preference controllers.

Removes suggestion code that was replaced in ag/5172561 as the homepage was the only consumer.

Bug: 112931076

Test: build, deploy, navigate to each setting, verify suggestion appears.
Change-Id: I405f9ed8b65d5898da7e2059c96f698a490b4c8a
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index a7a83f8..0d0c243 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -109,6 +109,10 @@
         <activity android:name=".security.SettingsScreenLockActivity"
                   android:configChanges="orientation|keyboardHidden|screenSize"
                   android:windowSoftInputMode="adjustResize">
+            <intent-filter>
+                <action android:name="android.car.settings.SCREEN_LOCK_ACTIVITY" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
         </activity>
 
         <activity android:name=".security.SetupWizardScreenLockActivity"