fpi-device: Ensure FpDeviceClass is still compatible with TODv1 ABI

Tests are ensuring it, adapt internal tests to ignore new features when
using old drivers

tests/test-device-fake.h

@@ -32,8 +32,6 @@ struct _FpiDeviceFake
   gpointer        last_called_function;
   gboolean        return_action_error;
 
-  GCancellable   *ext_cancellable;
-
   GError         *ret_error;
   FpPrint        *ret_print;
   FpPrint        *ret_match;
@@ -41,12 +39,14 @@ struct _FpiDeviceFake
   FpImage        *ret_image;
   GPtrArray      *ret_list;
 
-  GError         *ret_suspend;
-  GError         *ret_resume;
-
   gpointer        action_data;
   gpointer        user_data;
 
+  GCancellable   *ext_cancellable;
+
+  GError         *ret_suspend;
+  GError         *ret_resume;
+
   FpDeviceFeature probe_features_update;
   FpDeviceFeature probe_features_value;
 };