Add stubs for new API triggerPostinstall

Test: th
Bug: 377557752
Change-Id: I73beaae7feebb12d944d59496db2cf8c89115e93
diff --git a/aosp/service_delegate_android_interface.h b/aosp/service_delegate_android_interface.h
index 45c0274..c73c6de 100644
--- a/aosp/service_delegate_android_interface.h
+++ b/aosp/service_delegate_android_interface.h
@@ -68,6 +68,9 @@
       const std::vector<std::string>& key_value_pair_headers,
       Error* error) = 0;
 
+  virtual bool TriggerPostinstall(const std::string& partition,
+                                  Error* error) = 0;
+
   // Suspend an ongoing update. Returns true if there was an update ongoing and
   // it was suspended. In case of failure, it returns false and sets |error|
   // accordingly.