Move ActionManager to its own file

Bug: 36970783
Test: build
Change-Id: I08fa39052236b462249f79de1d02bf02bdbf4c84
diff --git a/init/reboot.cpp b/init/reboot.cpp
index a88a42d..242750a 100644
--- a/init/reboot.cpp
+++ b/init/reboot.cpp
@@ -50,6 +50,7 @@
 #include <private/android_filesystem_config.h>
 #include <selinux/selinux.h>
 
+#include "action_manager.h"
 #include "capabilities.h"
 #include "init.h"
 #include "property_service.h"