CEC: Add event handler to default HdmiCec

Event handler polls the file descriptor for
CEC messages and events

Bug: 185434120
Test: manual
Change-Id: Iaaec9a0a74b264e5ec8625d7fce3d821208fd5ac
diff --git a/tv/cec/1.0/default/HdmiCecDefault.h b/tv/cec/1.0/default/HdmiCecDefault.h
index 4812eca..c3682f7 100644
--- a/tv/cec/1.0/default/HdmiCecDefault.h
+++ b/tv/cec/1.0/default/HdmiCecDefault.h
@@ -47,6 +47,7 @@
 
     Return<Result> init();
     Return<void> release();
+    static void* event_thread(void*);
 };
 
 }  // namespace implementation