confirmationui: explicitly declare only one thread.

Due to an unclear API, wireless_charger accidentally started
two threads.

Bug: 80102279
Test: use lshal to verify that the service only has one thread
Change-Id: Ic6bdb6ef0025173f4388f0550e00a6b4fc2e21df
diff --git a/confirmationui/1.0/default/service.cpp b/confirmationui/1.0/default/service.cpp
index 58ec66a..39f3f62 100644
--- a/confirmationui/1.0/default/service.cpp
+++ b/confirmationui/1.0/default/service.cpp
@@ -27,6 +27,7 @@
 using android::hardware::confirmationui::V1_0::implementation::ConfirmationUI;
 
 int main() {
+    ::android::hardware::configureRpcThreadpool(1, true /*willJoinThreadpool*/);
     auto confirmationui = new ConfirmationUI();
     auto status = confirmationui->registerAsService();
     if (status != android::OK) {