Add stub implementation for APIs to switch slot

Test: build
Bug: 187321613
Change-Id: Icdd402df711c8d35962bad2ef70f3c43e069c83b
diff --git a/aosp/update_attempter_android.h b/aosp/update_attempter_android.h
index 3633178..7fa01e8 100644
--- a/aosp/update_attempter_android.h
+++ b/aosp/update_attempter_android.h
@@ -96,6 +96,9 @@
   void CleanupSuccessfulUpdate(
       std::unique_ptr<CleanupSuccessfulUpdateCallbackInterface> callback,
       brillo::ErrorPtr* error) override;
+  bool setShouldSwitchSlotOnReboot(const std::string& metadata_filename,
+                                   brillo::ErrorPtr* error) override;
+  bool resetShouldSwitchSlotOnReboot(brillo::ErrorPtr* error) override;
 
   // ActionProcessorDelegate methods:
   void ProcessingDone(const ActionProcessor* processor,