do not start shutdown animation from init

- init will only keep animation related services as shutdown critical.
- external component like system server can start shutdown animation.

bug: 37500823
Test: reboot
Change-Id: Ief328306eba7e3b15402ae27e6236767095f508c

init/reboot.cpp

@@ -341,18 +341,9 @@ void DoReboot(unsigned int cmd, const std::string& reason, const std::string& re
     Service* bootAnim = ServiceManager::GetInstance().FindServiceByName("bootanim");
     Service* surfaceFlinger = ServiceManager::GetInstance().FindServiceByName("surfaceflinger");
     if (bootAnim != nullptr && surfaceFlinger != nullptr && surfaceFlinger->IsRunning()) {
-        property_set("service.bootanim.exit", "0");
-        // Could be in the middle of animation. Stop and start so that it can pick
-        // up the right mode.
-        bootAnim->Stop();
-        // start all animation classes if stopped.
         ServiceManager::GetInstance().ForEachServiceInClass("animation", [](Service* s) {
-            s->Start();
             s->SetShutdownCritical();  // will not check animation class separately
         });
-        bootAnim->Start();
-        surfaceFlinger->SetShutdownCritical();
-        bootAnim->SetShutdownCritical();
     }
 
     // optional shutdown step