Move EventHub over to using EPOLLWAKEUP when available

Bug: 10901016
Change-Id: If63c0de5cf120cdf1534d63fc2382d2925b35c6a
diff --git a/services/input/EventHub.h b/services/input/EventHub.h
index ae28f01..e54b9fc 100644
--- a/services/input/EventHub.h
+++ b/services/input/EventHub.h
@@ -440,6 +440,8 @@
     size_t mPendingEventCount;
     size_t mPendingEventIndex;
     bool mPendingINotify;
+
+    bool mUsingEpollWakeup;
 };
 
 }; // namespace android