Remove support v1

Support v1 is no longer used and we want to keep the codebase clean.

Test: robotests still pass
Bug: 70620533
Change-Id: Ic8af0f34aab510a533bd7a7ec5c059834395baf5

src/com/android/settings/Settings.java

@@ -162,7 +162,6 @@ public class Settings extends SettingsActivity {
         }
     }
     public static class WebViewAppPickerActivity extends SettingsActivity { /* empty */ }
-    public static class LegacySupportActivity extends SettingsActivity{ /* empty */ }
 
     // Top level categories for new IA
     public static class NetworkDashboardActivity extends SettingsActivity {}