SF: Set up libscheduler headers

Start pulling Scheduler sources into a libscheduler target akin to
librenderengine and libcompositionengine.

Bug: 185535769
Test: Build
Change-Id: I8ee871cce96209c8c53601152501129b09c5e46f
diff --git a/services/surfaceflinger/Scheduler/VsyncConfiguration.h b/services/surfaceflinger/Scheduler/VsyncConfiguration.h
index 8447512..02ebd70 100644
--- a/services/surfaceflinger/Scheduler/VsyncConfiguration.h
+++ b/services/surfaceflinger/Scheduler/VsyncConfiguration.h
@@ -23,7 +23,8 @@
 #include <ftl/small_map.h>
 #include <utils/Timers.h>
 
-#include "Fps.h"
+#include <scheduler/Fps.h>
+
 #include "VsyncModulator.h"
 
 namespace android::scheduler {