Remove references to sched_policy.h

As part of scheduling policy cleanup, remove obsolete
references to sched_policy.h and its APIs.

Change-Id: Id957d11dd645cdf9d53dd6c02e568369aef23243
diff --git a/media/libstagefright/TimedEventQueue.cpp b/media/libstagefright/TimedEventQueue.cpp
index f4b5d4f..6d345bb 100644
--- a/media/libstagefright/TimedEventQueue.cpp
+++ b/media/libstagefright/TimedEventQueue.cpp
@@ -26,8 +26,6 @@
 
 #include "include/TimedEventQueue.h"
 
-#include <cutils/sched_policy.h>
-
 #include <sys/prctl.h>
 #include <sys/time.h>