init: separate out epoll into a class

Test: init_tests
Bug: 64114943
Change-Id: I5f03314773b02b9e30e8e21895b6bdcfd4909e88
diff --git a/init/keychords.h b/init/keychords.h
index 689a3b5..f3aecbb 100644
--- a/init/keychords.h
+++ b/init/keychords.h
@@ -17,12 +17,12 @@
 #ifndef _INIT_KEYCHORDS_H_
 #define _INIT_KEYCHORDS_H_
 
-#include "service.h"
+#include "epoll.h"
 
 namespace android {
 namespace init {
 
-void KeychordInit();
+void KeychordInit(Epoll* init_epoll);
 
 }  // namespace init
 }  // namespace android