Revert "Move FlagManager to a common SF lib"

Revert submission 25261159-flagmanager_common

Reason for revert: build breakage: b/310935941

Reverted changes: /q/submissionid:25261159-flagmanager_common

Change-Id: I44795b34c4ef97b78c080d6421eb61a454675ddb
diff --git a/services/surfaceflinger/Scheduler/VSyncDispatchTimerQueue.cpp b/services/surfaceflinger/Scheduler/VSyncDispatchTimerQueue.cpp
index ef30887..3e7ec49 100644
--- a/services/surfaceflinger/Scheduler/VSyncDispatchTimerQueue.cpp
+++ b/services/surfaceflinger/Scheduler/VSyncDispatchTimerQueue.cpp
@@ -25,7 +25,7 @@
 
 #include <scheduler/TimeKeeper.h>
 
-#include <common/FlagManager.h>
+#include "FlagManager.h"
 #include "VSyncDispatchTimerQueue.h"
 #include "VSyncTracker.h"