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/main_surfaceflinger.cpp b/services/surfaceflinger/main_surfaceflinger.cpp
index 6c8972f..9889cb9 100644
--- a/services/surfaceflinger/main_surfaceflinger.cpp
+++ b/services/surfaceflinger/main_surfaceflinger.cpp
@@ -29,12 +29,12 @@
 #include <binder/IPCThreadState.h>
 #include <binder/IServiceManager.h>
 #include <binder/ProcessState.h>
-#include <common/FlagManager.h>
 #include <configstore/Utils.h>
 #include <displayservice/DisplayService.h>
 #include <errno.h>
 #include <hidl/LegacySupport.h>
 #include <processgroup/sched_policy.h>
+#include "FlagManager.h"
 #include "SurfaceFlinger.h"
 #include "SurfaceFlingerFactory.h"
 #include "SurfaceFlingerProperties.h"