Use DashboardFeatureProvider to load homepage tiles.

Adding support to homepage category.

Test: SettingsRoboTests for regression. Will write tests for new feature
soon once we are set on the data structure.
Bug: 31781480

Change-Id: I25fa367fecb643f17e23f0182df7585bf1fcdd02

src/com/android/settings/Settings.java

@@ -159,4 +159,8 @@ public class Settings extends SettingsActivity {
     public static class DeviceSettings extends SettingsActivity { /* empty */ }
     public static class PersonalSettings extends SettingsActivity { /* empty */ }
     public static class SystemSettings extends SettingsActivity { /* empty */ }
+
+    // Top level categories for new IA
+    public static class SupportActivity extends SettingsActivity {}
+
 }